Practice the problems of Math in Focus Grade 1 Workbook Answer Key Chapter 8 Addition and Subtraction Facts to 20 to score better marks in the exam.
Math in Focus Grade 1 Chapter 8 Answer Key Addition and Subtraction Facts to 20
Put On Your Thinking Cap!
Challenging Practice
Question 1.
10 
6 = 4
Answer: 10 – 6 = 4
Question 2.
7 5 = 12
Answer: 7 + 5 = 12
Question 3.
16 9 = 7
Answer: 16 – 9 = 7
Question 4.
9 7 = 16
Answer: 9 + 7 = 16
Question 5.
11 3 = 14
Answer: 11 + 3 = 14
Question 6.
14 6 = 20
Answer: 14 + 6 = 20
Question 7.
17 2 = 15
Answer: 17 – 2 = 15
Question 8.
12 8 = 20
Answer: 12 + 8 = 20
Fill in the blanks.
Question 9.
18 – ______ = 10
Answer: 18 – 8 = 10
Question 10.
______ – 9 = 11
Answer: 20 – 9 = 11
Question 11.
20 – ______ = 20
Answer: 20 – 0 = 20
Question 12.
______ – 6 = 6
Answer: 12 – 6 = 6
Question 13.
______ + 3 = 12
Answer: 9 + 3 = 12
Question 14.
______ + 5 = 13
Answer: 8 + 5 = 13
Solve.
Question 15.
Dane gets 2 baskets in a computer game. His total score is 16.
a. Color 2 baskets that he gets.
Answer:
b. Which are the 2 baskets that he got? Write an addition sentence for them.
_____ + _____ = 16
Answer: 11 + 5 = 16
c. Look for other answers. Write them here.
___ + ___ = 16
___ + ___ = 16
Answer:
12 + 4 = 16
9 + 7 = 16
Put On Your Thinking Cap!
Problem Solving
Solve.
Ed did 6 more cartwheels than Lila. How many cartwheels did Ed and Lila each do?
Write four possible pairs of numbers. The total number of cartwheels cannot be more than 20.
Question 1.
If Lila did ________ cartwheels, then Ed did ________ cartwheels.
Answer: If Lila did 7 cartwheels, then Ed did 13 cartwheels.
7 + 13 = 20
Question 2.
If Lila did ________ cartwheels, then Ed did ________ cartwheels.
Answer: If Lila did 8 cartwheels, then Ed did 12 cartwheels.
8 + 12 = 20
Question 3.
If Ed did ________ cartwheels, then Lila did ________ cartwheels.
Answer: If Ed did 14 cartwheels, then Lila did 6 cartwheels.
14 + 6 = 20
Question 4.
If Ed did ________ cartwheels, then Lila did ________ cartwheels.
Answer:
If Ed did 10 cartwheels, then Lila did 10 cartwheels.
10 + 10 = 20
Fill the 
with any of these numbers. Use each number once.
Question 5.
Answer:
Chapter Review/Test
Vocabulary
Circle the correct answers.
Question 1.
Which numbers are the same?
4 9 6 0 4
Answer: 4 and 4 are the same numbers
Question 2.
Which fact is a doubles fact?
9 + 1 = 10 4 + 8 = 12 9 + 9 = 18
Answer: 9 + 9 = 18 is a doubles fact.
Question 3.
Which fact is a doubles plus one fact?
1 + 2 = 3 3 + 3 = 6 9 + 2 = 11
Answer: 1 + 2 = 3 is a doubles plus one fact.
Concepts and Skills
Fill in the blanks.
Question 4.
6 + 5 = ____
Answer: 11
Question 5.
9 + 6 = ___
Answer: 15
Complete the number bonds. Then fill in the blanks.
Question 6.
Answer:
Question 7.
Answer:
Question 8.
Answer:
Question 9.
Answer:
Fill in the blanks.
Question 10.
11 + 9 = ____
Answer: 20
Question 11.
12 – 5 = ____
Answer: 7
Problem Solving
Solve.
Question 12.
Andy has 9 stickers. His sister gives him 5 more. How many stickers does Andy have in all?
Andy has ________ stickers in all.
Answer:
Given,
Andy has 9 stickers,
His sister gave 5 more stickers,
By adding 9 with 5 we get 14,
Therefore, Andy has 14 stickers in all.
Question 13.
Tia has 14 hair clips. She gives 7 hair clips to her sister. How many hair clips does Tia have left?
Tia has ________ hair clips left.
Answer:
Given,
Tia has 14 hair clips,
She gives away 7 hair clips to her sister,
By subtracting 7 from 14 we get 7,
Therefore, Tia has 7 hair clips left.
Question 14.
I am double 6 plus 1 more. What number am I? I am the number ____
Answer:
I am the number 13.