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

## Math in Focus Grade 1 Chapter 14 Answer Key Mental Math Strategies

**Put On Your Thinking cap!**

**Challenging Practice**

You can use a telephone dial to find the value of a word.

Example

YES = 9 + 3 + 7 = 19

Question 1.

Name a three-letter word with a value of 14. _____

Answer: MAT=6+2+6=14 is a three-letter word with a value of 14

Question 2.

Find a word that has the same value as BOAT. _____

Answer: GUN is a word that has the same value as BOAT

BOAT=2+6+2+8=18

GUN=4+8+6=18

Question 3.

Think of a four-letter word. Find its value. Ask your friend to guess the word.

Answer: KITE = 5+4+8+3 =20

**Put on Your Thinking Cap!**

**Problem Solving**

There are 6 bicycles and tricycles at Sunshine Day Care Center. There are 16 wheels in all. How many bicycles are there?

**Chapter Review/Test**

**Vocabulary**

**Choose the correct word.**

Question 1.

To help you subtract ____ think of addition.

Answer: To help you subtract a value think of addition.

Question 2.

4 + 4 = 8 is a ____

Answer: 4 + 4 = 8 is a addition

**Concepts and Skills**

**Add mentally.**

Question 3.

25 + 4 = ____

Answer: 25+4=29

adding 25 with 4 we get 29

Question 4.

33 + 4 = ____

Answer: 33+4=37

adding 33 with 4 we get 37

Question 5.

10 + 28 = ____

Answer: 10 + 28 = 38

adding 10 with 28we get 38

Question 6.

15 + 20 = ____

Answer: 15 + 20 = 35

adding 15 with 20 we get 35

Question 7.

6 + 7 = ___

Answer: 6+7=13

adding 6 with 7 we get 13

Question 8.

4 + 7 = ____

Answer: 4+7=11

adding 4 with 7 we get 11

**Subtract mentally. Think of addition.**

Question 9.

8 – 6 = ____

Answer:8-6=2

By removing 6 from 8 we get 2

Question 10.

9 – 7 = ____

Answer:9 – 7 = 2

By removing 7 from 9 we get 2

Question 11.

16 – 7 = ____

Answer:16 – 7 =

By removing 7 from 16 we get 9

Question 12.

18 – 9 = ____

Answer:18 – 9 =

By removing 9 from 18 we get 9

Question 13.

15 – 8 = ____

Answer: 15 – 8 =7

By removing 8 from 15 we get 7

Question 14.

14 – 7 = ____

Answer:14 – 7 = 7

By removing 7 from 14 we get 7

**Subtract mentally.**

Question 15.

15 – 4 = ______

Answer: 15 – 4 = 11

By removing 4 from 15 we get 11

Question 16.

38 – 6 = ______

Answer:38 – 6 = 32

By removing 6 from 38 we get 32

Question 17.

21 – 10 = ___

Answer: 21 – 10 =

By removing 10 from 21 we get 11

Question 18.

37 – 20 = ___

Answer: 37 – 20 = 17

By removing 20 from 37 we get 17

**Problem Solving**

**Fill in the blanks.**

Question 19.

How many stamps are left? _____

Answer: 23 stamps are left

27-4=23

By removing 4 from 27 we get 23

Question 20.

13 children are on a school bus. 6 more children get on the bus. ____

Answer: Now there are a total of 19 children on a school bus

13+6=19

adding 13 with 6 we get 19