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## McGraw-Hill Math Grade 3 Answer Key Chapter 2 Lesson 1 Adding in Any Order

**Solve**

**Add. Write the sum.**

Question 1.

17 + 2 = __19__

2 + 17 = ____

Answer:

17 + 2 = 19

2 + 17 = 19

Explanation:

The numbers that we add are called addends

The order of the addends does not matter

The sum does not change

So, 17 + 2 = 2 + 17.

Question 2.

8 + 1 = ___

1 + 8 = ____

Answer:

8 + 1 = 9

1 + 8 = 9

Explanation:

The numbers that we add are called addends

The order of the addends does not matter

The sum does not change

So, 8 + 1 = 1 + 8.

Question 3.

12 + 5 = ___

5 + 12 = ____

Answer:

12 + 5 = 17

5 + 12 = 17

Explanation:

The numbers that we add are called addends

The order of the addends does not matter

The sum does not change

So, 12 + 5 = 5 + 12.

Question 4.

3 + 5 = ___

5 + 3 = ___

Answer:

3 + 5 = 8

5 + 3 = 8

Explanation:

The numbers that we add are called addends

The order of the addends does not matter

The sum does not change

So, 3 + 5 = 5+3.

Question 5.

Answer:

Explanation:

The order of the addends does not matter

The sum does not change

So, 10 + 5 = 5 + 10.

Question 6.

Answer:

Explanation:

The order of the addends does not matter

The sum does not change

So, 7 + 1 = 1 + 7.

Question 7.

Answer:

Explanation:

The order of the addends does not matter

The sum does not change

So, 3 + 13 = 13 + 3.

**Write the missing number.**

Question 8.

12 + 3 = 3 + ___

Answer:

12 + 3 = 3 +12

Explanation:

The order of the addends does not matter

The sum does not change

The missing number is 12

So, 12 + 3 = 3 + 12.

Question 9.

___ + 6 = 6 + 13

Answer:

13 + 6 = 6 +13

Explanation:

The order of the addends does not matter

The sum does not change

The missing number is 13

So, 13 + 6 = 6 +13.

Question 10.

1 + ___ = 8 + 1

Answer:

1 + 8 = 8 + 1

Explanation:

The order of the addends does not matter

The sum does not change

The missing number is 8

So, 1 + 8 = 8 + 1.

Question 11.

Chen and Alex see 1 cat and 3 dogs. They count to see how many animals in all. Chen counts the dogs first and then the cat. Alex counts the cat first and then the dogs. Are the sums different? Explain.

Answer:

No, both the sums are same

Explanation:

Chen and Alex see 1 cat and 3 dogs

They count to see how many animals in all

Chen counts the dogs first and then the cat

That is 3 + 1 = 4

Alex counts the cat first and then the dogs.

That is 1 + 3 = 4

The order of the addends is different but the sum is same

So, Both the sums are same.