This Grade 2 worksheet brings mental strategies to subtraction within 100. Multiple choice items ask second graders to pick the best mental step, such as subtracting a friendly ten and adding back, or breaking the subtrahend into tens and ones. Five fill-ins apply the same strategies to problems like 70 minus 25 and 62 minus 19, building flexibility and speed with mental subtraction.
Style:
Mental Math Within 100
Part A: Multiple Choice
Circle the best answer for each question.
1. Use parts to solve 65 - 22. First do 65 - 20, then subtract 2. What is the answer?
A) 43
B) 45
C) 47
D) 53
2. Which is the quickest mental strategy for 80 - 39?
A) Count on by ones
B) Subtract 40, then add 1 back
C) Double 39
D) Add 80 + 39
3. Count back from 78 by tens three times. What number do you land on?
A) 58
B) 48
C) 38
D) 28
4. Which split is best for mentally finding 94 - 37?
A) 94 - 30 - 7
B) 94 - 7 - 30
C) 94 + 30 - 7
D) 94 + 7 + 30
Part B: Fill in the Blank
Write the correct answer on each line.
1. 70 - 25 by parts is (70 - 20) - 5 = 45.
2. Count back by tens: 83, 73, 63, 53. So 83 - 30 = 53.
3. Use compensation: 62 - 19 = 62 - 20 + 1 = 43.
4. 90 - 48 using compensation is 90 - 50 + 2 = 42.
5. 56 - 24 split into parts is 56 - 20 - 4 = 32.
Mental Math Within 100
★ Part A: Multiple Choice
Circle the best answer for each question.
1. Use parts to solve 65 - 22. First do 65 - 20, then subtract 2. What is the answer?
A) 43
B) 45
C) 47
D) 53
2. Which is the quickest mental strategy for 80 - 39?
A) Count on by ones
B) Subtract 40, then add 1 back
C) Double 39
D) Add 80 + 39
3. Count back from 78 by tens three times. What number do you land on?
A) 58
B) 48
C) 38
D) 28
4. Which split is best for mentally finding 94 - 37?
A) 94 - 30 - 7
B) 94 - 7 - 30
C) 94 + 30 - 7
D) 94 + 7 + 30
★ Part B: Fill in the Blank
Write the correct answer on each line.
1) 70 - 25 by parts is (70 - 20) - 5 = 45.
2) Count back by tens: 83, 73, 63, 53. So 83 - 30 = 53.
3) Use compensation: 62 - 19 = 62 - 20 + 1 = 43.
4) 90 - 48 using compensation is 90 - 50 + 2 = 42.
5) 56 - 24 split into parts is 56 - 20 - 4 = 32.
Ready to Practice?
Complete each section carefully.
9 Questions
12-18 minutes
Auto-graded
Retry anytime
🏆
Questions Correct
0
Correct
0
Incorrect
0
Skipped
0:00
Time
0%
Score
Review Your Answers
See what you got right, missed, or skipped.