Subtraction within 10 — Answer Key
Part A: Multiple Choice
Circle the correct answer for each question.
1. If 3 + 7 = 10, which subtraction fact belongs to the same fact family?
A) 10 - 5 = 5
B) 10 - 7 = 3
C) 10 - 4 = 6
D) 7 - 3 = 4
10 - 7 = 3 belongs to the same fact family as 3 + 7 = 10. The three numbers 3, 7, and 10 are used in all four facts of this family.
2. Which subtraction sentence is part of the same fact family as 4 + 5 = 9?
A) 9 - 6 = 3
B) 9 - 4 = 5
C) 8 - 5 = 3
D) 9 - 3 = 6
9 - 4 = 5 belongs to the same fact family as 4 + 5 = 9. The numbers 4, 5, and 9 make up this fact family.
3. If 6 + 2 = 8, what is 8 - 2?
A) 4
B) 5
C) 6
D) 7
8 - 2 = 6. Because 6 + 2 = 8, we know the related subtraction fact 8 - 2 = 6.
4. Which number goes in the blank? 5 + ___ = 9, so 9 - 5 = ___
A) 3
B) 5
C) 4
D) 6
5 + 4 = 9, so 9 - 5 = 4. The missing number is 4 in both blanks.
Part B: Fill in the Missing Number
Write the missing number to complete each number sentence.
1. 10 - 7 = 3
10 - 7 = 3. The missing subtrahend is 7 because 3 + 7 = 10.
2. 8 - 6 = 2
8 - 6 = 2. The missing minuend is 8 because 2 + 6 = 8.
3. 9 - 8 = 1
9 - 8 = 1. The missing subtrahend is 8 because 9 - 8 = 1.
4. 10 - 4 = 6
10 - 4 = 6. The missing minuend is 10 because 6 + 4 = 10.
5. 7 - 7 = 0
7 - 7 = 0. When you subtract a number from itself, the answer is always 0.