Practice the problems of Math in Focus Grade 1 Workbook Answer Key Chapter 14 Practice 1 Mental Addition to score better marks in the exam.

## Math in Focus Grade 1 Chapter 14 Practice 1 Answer Key Mental Addition

**Add mentally.**

**First add the ones.**

**Then add the ones to the tens.**

Example

Question 1.

15 + 2 = ____

Answer: 17

Question 2.

12 + 4 = ____

Answer: 16

Question 3.

35 + 1 = ___

Answer: 36

Question 4.

23 + 5 = ____

Answer: 28

Question 5.

22 + 7 = ___

Answer: 29

Question 6.

31 + 8 = ___

Answer:

Question 7.

6 + 32 = ____

Answer:

Question 8.

5 + 34 = ____

Answer:

**Add mentally.**

**First add the tens.**

**Then add the tens to the ones.**

Example

Question 9.

18 + 10 = ____

Answer:

Question 10.

11 + 20 = ____

Answer: 31

Question 11.

12 + 10 = ____

Answer: 22

Question 12.

14 + 20 = ____

Answer: 34

Question 13.

16 + 10 = ____

Answer: 26

Question 14.

20 + 19 = ____

Answer: 39

Question 15.

10 + 17 = ___

Answer: 27

Question 16.

20 + 13 = ____

Answer: 33

Question 17.

10 + 14 = ____

Answer: 24

Question 18.

20 + 16 = ____

Answer: 36

**Add mentally. Use doubles facts.**

Example

Question 19.

4 + 5 = ____

Answer: 9

By doubling and adding 4 with 4 we get 8,

Then adding 8 with 1 we get 9.

Question 20.

7 + 8 = _____

Answer: 15

By doubling and adding 7 with 7 we get 14,

Then adding 14 with 1 we get 15.

Question 21.

5 + 6 = ___

Answer: 11

By doubling and adding 5 with 5 we get 10,

Then adding 10 with 1 we get 11.

Question 22.

8 + 9 = ____

Answer: 17

By doubling and adding 8 with 8 we get 16,

Then adding 16 with 1 we get 17.

**Solve mentally. Fill in the blanks.**

Question 23.

How many stickers will Emily have? ____

Answer:

Given,

Emily have 24 stickers and she needs 5 more,

By adding 24 with 5 we get 29,

Therefore, Emily will have 29 stickers in total.

**Solve mentally. Fill in the blanks.**

Question 24.

How many marbles are there in the box now? ____

Answer:

Given,

There are 18 marbles in the box,

And added 20 more marbles to it,

By adding 18 with 20 we get 38,

Therefore, there are 38 marbles in the box.

Question 25.

How many muffins does Baker Ross bake in all? _____

Answer:

Given,

There are 11 pecan muffins,

And 6 oat muffins,

By adding 11 with 6 we get 17,

Therefore, there are 17 muffins in total.