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McGraw-Hill Math Grade 3 Answer Key Chapter 3 Lesson 12 Problem Solving: Writing a Number Sentence
Solve
Write a number sentence to solve each problem
Question 1.
Last week 57 people visited the animal shelter. This week 64 people visited. How many people visited the animal shelter in the last two weeks?
57 + 64 = ?
57 + 54 = 121 people
Answer:
Number of people visited the animal shelter in the last two weeks = 121.
Explanation:
Number of people visited the animal shelter last week = 57.
Number of people visited the animal shelter this week = 64.
Number of people visited the animal shelter in the last two weeks = Number of people visited the animal shelter last week + Number of people visited the animal shelter this week
= 57 + 64
= 121.
Question 2.
This week the animal shelter spent $350 on dog food and $160 on cat food. How much more did the shelter spend on dog food than cat food this week?
Answer:
$190 more the shelter spend on dog food than cat food this week.
Explanation:
Amount of money this week the animal shelter spent on dog food = $350.
Amount of money this week the animal shelter spent on cat food = $160.
Difference:
Amount of money this week the animal shelter spent on dog food – Amount of money this week the animal shelter spent on cat food
= $350 – $160
= $190.
Question 3.
Last year the animal shelter took in 17 white cats. This year the animal shelter took in 12 white cats. How many more white cats did the shelter take in last year than it did this year?
Answer:
5 more white cats the shelter take in last year than it did this year.
Explanation:
Number of white cats Last year the animal shelter took = 17.
Number of white cats this year the animal shelter took = 12.
Difference:
Number of white cats Last year the animal shelter took – Number of white cats this year the animal shelter took
= 17 – 12
= 5.
Question 4.
On Saturday, volunteers collected $549 for the animal shelter. On Sunday, they collected $368. How much money did the volunteers collect last weekend?
Answer:
Amount collected by volunteers for the animal shelter last weekend = $917.
Explanation:
Amount collected by volunteers for the animal shelter on Saturday = $549.
Amount collected by volunteers for the animal shelter on Sunday = $368.
Amount collected by volunteers for the animal shelter last weekend = Amount collected by volunteers for the animal shelter on Saturday + Amount collected by volunteers for the animal shelter on Sunday
= $549 + $368
= $917.