Refer to our Texas Go Math Grade 2 Answer Key Pdf to score good marks in the exams. Test yourself by practicing the problems from Texas Go Math Grade 2 Lesson 5.1 Answer Key Addition Strategies.

## Texas Go Math Grade 2 Lesson 5.1 Answer Key Addition Strategies

**Explore**

Draw a picture to show the problem. Then write an addition sentence for the problem.

_________ toy cars

David has 9 toy cars in his bag and he got 6 more toy cars as gifts on his birthday, now total how many cars David has?

Answer:

6 toy cars.

Explanation:

9 + 6 = 15

By using double fact we write 9 as 6 + 3

6 + 6 +3

=12 + 3

= 15

**FOR THE TEACHER** • Read the following problem and have children draw a picture for the problem. Nick has 4 toy cars. Adrian gives Nick 4 more toy cars. How many toy cars does Nick have now? After children draw pictures, have them write a number sentence for the problem.

Answer:

8 toy cars

Explanation:

Nick has 4 toy cars.

Adrian gives Nick 4 more toy cars.

4 + 4 is a double fact number.

So, Nick has 8 toy cars.

**Math Talk**

**Mathematical Processes**

Explain why 3 + 3 = 6 is called a doubles fact.

Answer:

A double fact in math is a doubled value that is easy to remember,

such as the equation 3 + 3 = 6 is called a doubles fact.

Explanation:

Any doubled number is a double fact,

but double facts are most commonly used when they are small numbers,

usually less than 12.

**Model and Draw**

Doubles facts can be used to find other sums.

5 + 5 = 10

Changing the order of addends does not change the sum.

7 + 1 = 8

1 + 7 = 8

3 + 6 = ___________

6 + 3 = ___________

Answer:

3 + 6 = 9

6 + 3 = 9

Explanation:

Changing the order of addends does not change the sum.

**Share and Show**

Question 1.

3 + 4 = ___________

Answer:

3 + 4 = 7

Explanation:

By using double fact we write 4 as 3 + 1

3 + 3 +1

=6 + 1

= 7

Question 2.

7 + 0 = ___________

Answer:

7 + 0 = 7

Explanation:

If 0 is added to any number the sum is the number itself.

Question 3.

___________ = 1 + 8

Answer:

9 = 1 + 8

Explanation:

By using double fact we write 8 as 4 + 4

4 + 4 +1

=8 + 1

= 9

Question 4.

2 + 3 = ___________

Answer:

2 + 3 = 5

Explanation:

By using double fact we write 3 as 2 + 1

2 + 2 +1

= 4 + 1

= 5

Question 5.

___________ = 5 + 1

Answer:

6 = 5 + 1

Explanation:

By using double fact we write 5 as 2 + 2 + 1

2 + 2 + 1 +1

= 4 + 1 + 1

= 5 + 1

= 6

Question 6.

4 + 2 = ___________

Answer:

4 + 2 = 6

Explanation:

By using double fact we write 2 as 1 + 1

4 + 1 +1

= 5 + 1

= 6

Question 7.

5 + 3 = ___________

Answer:

5 + 3 = 8

Explanation:

By using double fact we write 5 as 3 + 2

3 + 3 +2

= 6 + 2

= 8

Question 8.

4 + 4 = ___________

Answer:

4 + 4 = 8

Explanation:

4 + 4 are doubles to 8

So, the equation is a double fact.

Question 9.

___________ = 6 + 3

Answer:

9 = 6 + 3

Explanation:

By using double fact we write 6 as 3 + 3

3 + 3 + 3

=6 + 3

= 9

Question 10.

Answer: 6

Explanation:

3 + 3 are doubles to 6

So, the equation is a double fact.

Question 11.

Answer: 10

Explanation:

In double fact wee write 6 as 4 + 2

4 + 4 + 2

= 8 + 2

= 10

Question 12.

Answer: 8

Explanation:

If 0 is added to any number the sum is the number itself.