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## Texas Go Math Grade 3 Lesson 7.2 Answer Key Multiply with 5 and 10

**Essential Question**

How can you multiply with 5 and 10?

**Unlock the Problem**

Marcel is making 6 doll-sized banjos. He needs 5 strings for each banjo. How many strings does he need?

• How many banjos is Marcel making?

Answer:

6 doll-sized banjos is Marcel making.

Explanation:

Number of banjos is Marcel making = 6.

• How many strings does each banjo need?

Answer:

5 strings for each banjo needs.

Explanation:

Number of 5 strings for each banjo needs = 5.

**Use skip counting.**

Skip count by 5s until you say 6 numbers.

5, __, ___, ___, ___, ____

6 × 5 = ___

So, Marcel needs ___ strings.

Answer:

So, Marcel needs 30 strings.

Explanation:

Skip count by 5s until you say 6 numbers.

5, 10, 15, 20, 25, 30.

6 × 5 = 30.

**Example**

Use a number line.

Each string is 10 inches long. How many inches of string will Marcel use for each banjo?

- Draw 5 jumps for the 5 strings. Jump 10 spaces at a time for the length of each string.
- You land on 10, __, ___, __, and ___. 5 × 10 = ___

The numbers 10, 20, 30, 40, and 50 are multiples of 10.

So, Marcel will use __ inches of string for each banjo.

A multiple of 10 is any product that has 10 as one of its factors.

**Math Talk**

**Mathematical Processes**

What do you notice about the multiples of 10?

Answer:

Its noticed that multiples of 10 are having zeros in ones place.

Explanation:

Noticed that multiples of 10 are having zeros in ones place.

**Share and Show
**Question 1.

How can you use this number line to find 8 × 5?

Answer:

Explanation:

Number line is used as:

8 × 5 means multiplying 5 eight times.

=> 8 × 5 = 40.

**Math Talk**

**Mathematical Processes**

Explain how knowing 4 × 5 help you find 4 × 10.

Answer:

4 × 10 = (4 × 5) + (4 × 5) = 40.

Explanation:

4 × 10 = (4 × 5) + (4 × 5)

= 20 + 20

= 40.

**Find the product.
**Question 2.

2 × 5 = ___

Answer:

2 × 5 =10.

Explanation:

2 × 5 = (1 × 5) + (1 × 5)

= 5 + 5

= 10.

Question 3.

__ = 6 × 10

Answer:

60 = 6 × 10.

Explanation:

6 × 10 = (6 × 5) + (6 × 5)

= 30 + 30

= 60.

Question 4.

___ = 5 × 5

Answer:

25 = 5 × 5.

Explanation:

5 × 5 = 25.

Question 5.

10 × 7 = ___

Answer:

10 × 7 = 70.

Explanation:

10 × 7 = (5 × 7) + (5 × 7)

= 35 + 35

= 70.

Question 6.

Answer:

10 × 4 = 40.

Explanation:

10 × 4 = (5 × 4) + (5 × 4)

= 20 + 20

= 40.

Question 7.

Answer:

5 × 6 = 30.

Explanation:

5 × 6 = 30.

Question 8.

Answer:

10 × 0 = 0.

Explanation:

10 × 0 = (5 × 0) + (5 × 0)

= 0 + 0

= 0.

Question 9.

Answer:

5 × 3 = 15.

Explanation:

5 × 3 = 15.

**Problem Solving
**

**Algebra Use the pictures to find the unknown numbers.**

Question 10.

Answer:

3 × 5 = 15.

Explanation:

3 × 5 = 15.

Question 11.

Answer:

10 × 3 = 30.

Explanation:

10 × 3 = (5 × 3) + (5 × 3)

= 30.

**Complete the strip diagram to solve.
**Question 12.

Marcel played 5 songs on the banjo. If each song lasted 8 minutes, how long did he play?

Answer:

Number of minutes he played = 40.

Explanation:

Number of songs on the banjo Marcel played = 5.

Number of minutes each song lasted = 8.

Number of minutes he played = Number of songs on the banjo Marcel played × Number of minutes each song lasted

= 5 × 8

= 40.

Question 13.

There are 6 banjo players. If each player needs 10 sheets of music, how many sheets of music are needed?

Answer:

Number of sheets of music are needed = 60.

Explanation:

Number of banjo players = 6.

Number of sheets of music each player needs = 10.

Number of sheets of music are needed = Number of banjo players 5 × Number of sheets of music each player needs

= 6 × 10

= (6 × 5) + (6 × 5)

= 30 + 30

= 60.

**Problem Solving
**

**Use the table for 14-16.**

Question 14.

**Apply**John and his dad own 7 banjos. They want to replace the strings on all of them. How many strings should they buy? Write a multiplication sentence to solve.

Answer:

Number of strings should they buy = 35.

Explanation:

Number of banjos John and his dad own = 7.

Number of strings banjo has = 5.

Number of strings should they buy = Number of banjos John and his dad own × Number of strings banjo has

= 7 × 5

= 35.

Question 15.

**H.O.T. Multi-Step** The orchestra has 5 violins and 3 guitars that need new strings. What is the total number of strings that need to be replaced? Explain

Answer:

Total number of strings that need to be replaced = 38.

Explanation:

Number of violins the orchestra has = 5.

Number of strings violins has = 4.

Number of guitars the orchestra has = 3.

Number of strings guitars has = 6.

Total number of strings that need to be replaced = (Number of violins the orchestra has × Number of strings violins has) + (Number of guitars the orchestra has × Number of strings guitars has)

= (5 × 4) + (3 × 6)

= 20 + 18

= 38.

Question 16.

**Multi-Step** Mr. Lemke has 5 guitars, 4 banjos, and 2 mandolins. What is the total number of strings on Mr. Lemke’s instruments? Explain.

Answer:

Total number of strings on Mr. Lemke’s instruments = 66.

Explanation:

Number of guitars Mr. Lemke has = 5.

Number of strings guitars has = 6.

Number of banjos Mr. Lemke has = 4.

Number of strings banjo has = 5.

Number of mandolins Mr. Lemke has = 2.

Number of strings mandolins has = 8.

Total number of strings on Mr. Lemke’s instruments = (Number of guitars Mr. Lemke has × Number of strings guitars has) + (Number of banjos Mr. Lemke has × Number of strings banjo has) + (Number of mandolins Mr. Lemke has × Number of strings mandolins has)

= (5 × 6) + (4 × 5) + (2 × 8)

= 30 + 20 + 16

= 50 + 16

= 66.

Question 17.

**Use Diagrams** Mrs. Thompson has 4 shelves with 5 violins on each shelf. How many violins does Mrs. Thompson have? Complete the strip diagram to solve.

Answer:

Number of violins Mrs. Thompson have =20.

Explanation:

Number of shelves Mrs. Thompson has = 4.

Number of violins on each shelf = 5.

Number of violins Mrs. Thompson have = Number of shelves Mrs. Thompson has × Number of violins on each shelf

= 4 × 5

= 20.

Question 18.

**H.O.T. Write Math** **What’s the Error?** Mr. James has 3 banjos. Mr. Lewis has 5 times the number of banjos Mr. James has. Riley says Mr. Lewis has 12 banjos. Describe his error.

Answer:

Riley is not correct saying Mr. Lewis has 12 banjos because number of banjos Mr. Lewis has 15.

Explanation:

Number of banjos Mr. James has = 3.

Mr. Lewis has 5 times the number of banjos Mr. James has.

=> Number of banjos Mr. Lewis has = 5 × Number of banjos Mr. James has

= 5 × 3

= 15.

**Daily Assessment Task
**

**Fill in the bubble for the correct answer choice. Use multiplication strategies to help you solve.**

Question 19.

**Representations**Sam put together 6 pentominoes to make a shape. Each pentomino has 5 squares. How many squares are in Sam’s shape?

(A) 65

(B) 11

(C) 35

(D) 30

Answer:

Number of squares are in Sam’s shape = 30.

(D) 30.

Explanation:

Number of pentominoes to make a shape Sam put together = 6.

Number of squares each pentomino has = 5.

Number of squares are in Sam’s shape = Number of pentominoes to make a shape Sam put together × Number of squares each pentomino has

= 6 × 5

= 30.

Question 20.

Ali reads for 10 minutes each night before bed. How many minutes does Ali read in 7 nights?

(A) 17 minutes

(B) 70 minutes

(D) 80 minutes

(D) 60 minutes

Answer:

Number of minutes Ali read in 7 nights = 70.

(B) 70 minutes.

Explanation:

Number of minutes each night before bed Ali reads for = 10.

Number of nights = 7.

Number of minutes Ali read in 7 nights = Number of nights × Number of minutes each night before bed Ali reads for

= 7 × 10

= 70.

Question 21.

**Multi-Step Analyze** Mark is making 10 kites. He uses 5 yards of ribbon for each kite. He has already made 2 of the kites. How many yards of ribbon will Mark need to make the rest of the kites?

(A) 10 yards

(B) 50 yards

(C) 40 yards

(D) 13 yards

Answer:

Number of yards of ribbon Mark needs to make the rest of the kites = 40.

(C) 40 yards.

Explanation:

Number of kites Mark is making = 10.

Number of yards of ribbon for each kite he uses = 5.

Number of kites Mark made = 2.

Number of yards of ribbon Mark needs to make the rest of the kites = (Number of kites Mark is making × Number of yards of ribbon for each kite he uses) – (Number of kites Mark made × Number of yards of ribbon for each kite he uses)

= (10 × 5) – (2 × 5)

= 50 – 10

= 40.

**Texas Test Prep
**Question 22.

There are 5 guitars on each of 5 shelves at a music store. How many guitars are there?

(A) 1o

(B) 20

(C) 15

(D) 25

Answer:

Number of guitars are there = 25.

(D) 25.

Explanation:

Number of guitars on each shelf at a music store = 5.

Number of shelves at a music store = 5.

Number of guitars are there = Number of guitars on each shelf at a music store × Number of shelves at a music store

= 5 × 5

= 25.

### Texas Go Math Grade 3 Lesson 7.2 Homework and Practice Answer Key

**Complete the strip diagram to solve.
**Question 1.

A toy store has 6 shelves with 5 game boxes on each shelf. How many game boxes are there?

Answer:

Number of game boxes are there = 30.

Explanation:

Number of shelves a toy store has = 6.

Number of game boxes on each shelf = 5.

Number of game boxes are there = Number of shelves a toy store has × Number of game boxes on each shelf

= 6 × 5

= 30.

Question 2.

A clerk sells 5 boxes of cards. Each box has 10 cards. How many cards are there?

Answer:

Number of cards are there = 50.

Explanation:

Number of boxes of cards a clerk sells = 5.

Number of cards each box has = 10.

Number of cards are there = Number of boxes of cards a clerk sells × Number of cards each box has

= 5 × 10

= 50.

**Use the table for 3-5.
**Question 3.

Jordy buys 5 small ticket books. How many tickets does Jordy have? Write a multiplication sentence to solve.

Answer:

Number of tickets Jordy have = 20.

Explanation:

Number of small ticket books Jordy buys = 5.

Number of tickets of small size = 4.

Number of tickets Jordy have = Number of small ticket books Jordy buys × Number of tickets of small size

= 5 × 4

= 20.

Question 4.

The Dorsey family buys 5 medium books and 1 large book of tickets. What is the total number of tickets the Dorsey family has?

Answer:

Total number of tickets the Dorsey family has = 33.

Explanation:

Number of medium books of tickets the Dorsey family buys = 5.

Number of tickets of medium size = 5.

Number of large book of tickets the Dorsey family buys = 1.

Number of tickets of large size = 8.

Total number of tickets the Dorsey family has = (Number of medium books of tickets the Dorsey family buys × Number of tickets of medium size) + (Number of large book of tickets the Dorsey family buys × Number of tickets of large size)

= (5 × 5) + (1 × 8)

= 25 + 8

= 33.

Question 5.

Sharon needs 15 tickets to ride the Big Roller Coaster. How many medium books of tickets should she buy?

Answer:

Number of medium books of tickets should she buy = 3.

Explanation:

Number of tickets to ride the Big Roller Coaster Sharon needs = 15.

Number of tickets of medium size = 5.

Number of medium books of tickets should she buy = Number of tickets to ride the Big Roller Coaster Sharon needs ÷ Number of tickets of medium size

= 15 ÷ 5

= 3.

**Problem Solving
**Question 6.

Candles come in boxes of 4. Ms. Lee buys 10 boxes of candles for a party. How many candles does Ms. Lee buy?

Answer:

Number of candles Ms. Lee buys = 40.

Explanation:

Number of Candles in each box = 4.

Number of boxes of candles for a party Ms. Lee buys = 10.

Number of candles Ms. Lee buy = Number of Candles in each box × Number of boxes of candles for a party Ms. Lee buys

= 4 × 10

= 40.

Question 7.

Ms. Lee sets up 9 tables. Each table seats 5 people. How many people can sit at the tables?

Answer:

Number of people can sit at the tables = 45.

Explanation:

Number of tables Ms. Lee sets up = 9.

Number of people seats on each table = 5.

Number of people can sit at the tables = Number of tables Ms. Lee sets up × Number of people seats on each table

= 9 × 5

= 45.

**Texas Test prep
**

**Lesson Check**

**Fill in the bubble completely to show your answer.**

Question 8.

Five students each borrow 4 books from the library. How many books do the students borrow?

(A) 8

(B) 9

(C) 20

(D) 10

Answer:

Number of books the students borrowed = 20.

(C) 20.

Explanation:

Number of books from the library each student borrowed = 4.

Number of students = 5.

Number of books the students borrowed = Number of books from the library each student borrowed × Number of students

= 4 × 5

= 20.

Question 9.

There are 10 relay teams on the playground. Each team has 3 students. How many students are on relay teams?

(A) 10

(B) 31

(C) 13

(D) 30

Answer:

Number of students are on relay teams = 30.

(D) 30.

Explanation:

Number of relay teams on the playground = 10.

Number of students each team has = 3.

Number of students are on relay teams = Number of relay teams on the playground × Number of students each team has

= 10 × 3

= 30.

Question 10.

A grocery store has 8 bags of snack packs on a shelf. Each bag has 5 snack packs. How many snack packs does the store have?

(A) 58

(B) 85

(C) 40

(D) 50

Answer:

Number of snack packs the store have = 40.

(C) 40.

Explanation:

Number of bags of snack packs on a shelf a grocery store has = 8.

Number of snack packs each bag has = 5.

Number of snack packs the store have = Number of bags of snack packs on a shelf a grocery store has × Number of snack packs each bag has

= 8 × 5

= 40.

Question 11.

Sunrise Goat Farm has 5 pens. Each pen has 9 goats. How many goats are on the farm?

(A) 59

(B) 45

(C) 14

(D) 95

Answer:

Number of goats are on the farm = 45.

(B) 45.

Explanation:

Number of pens Sunrise Goat Farm has = 5.

Number of goats each pen has = 9.

Number of goats are on the farm = Number of pens Sunrise Goat Farm has × Number of goats each pen has

= 5 × 9

= 45.

Question 12.

**Multi-Step** Karl is making 9 belts. He uses 5 beads for each belt. He has already made 4 belts. How many beads will Karl need to make the rest of the belts?

(A) 25

(B) 45

(C) 18

(D) 20

Answer:

Number of beads Karl needs to make the rest of the belts = 25.

(A) 25.

Explanation:

Number of belts Karl is making = 9.

Number of beads for each belt he uses = 5.

Number of belts he has already made = 4.

Number of beads Karl needs to make the rest of the belts = (Number of belts Karl is making × Number of beads for each belt he uses) – ( Number of belts he has already made × Number of beads for each belt he uses)

= (9 × 5) – (4 × 5)

= 45 – 20

= 25.

Question 13.

**Multi-Step** Chris has 5 stacks of DVDs on a shelf. Each stack has 10 DVDs. If Chris adds 2 more identical stacks of DVDs to the shelves, how many DVDs will Chris have?

(A) 20

(B) 50

(C) 17

(D) 70

Answer:

Number of DVDs Chris have = 70.

(D) 70.

Explanation:

Number of stacks of DVDs on a shelf Chris has = 5.

Number of DVDs each stack has = 10.

Number of more identical stacks of DVDs added to the shelves = 2.

Number of DVDs Chris have = (Number of stacks of DVDs on a shelf Chris has × Number of DVDs each stack has) + (Number of more identical stacks of DVDs added to the shelves × Number of DVDs each stack has)

= (5 × 10) + (2 × 10)

= 50 + 20

= 70.