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

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.