In this Grade 2 worksheet, second graders tackle mental subtraction with regrouping within 100. Four multiple choice items focus on strategies like rounding to a friendly ten or breaking apart the subtrahend for problems like 52 minus 28. Five fill-in word problems apply the same strategies to real contexts with crayons, books, and ponds, helping Grade 2 students subtract across tens confidently in their heads.
Style:
Mental Math Within 100
Part A: Multiple Choice
Circle the best answer for each question.
1. What is the best mental step for 52 - 28?
A) 52 - 30 + 2
B) 52 - 30 - 2
C) 52 + 30 - 2
D) 52 - 20 - 8 by ones
2. To solve 63 - 27 by counting up, what is the first friendly jump?
A) From 27 to 30
B) From 27 to 50
C) From 27 to 27
D) From 27 to 63
3. Which strategy works best for 81 - 49?
A) 81 - 50 + 1
B) 81 - 50 - 1
C) 81 + 50 - 1
D) 81 - 40 - 9 by ones
4. Which is the best break-apart for 74 - 36?
A) 74 - 30 - 6
B) 74 - 6 - 30
C) 74 + 30 - 6
D) 74 - 36 on fingers
Part B: Fill in the Blank
Write the correct answer on each line.
1. A box has 52 crayons. 28 are used. Remaining crayons: 52 - 30 + 2 = 24.
2. A bag has 63 beads and 27 fall out. Count up 3 to 30, then 30 to 60, then 3 to 63. Beads lost: 36.
3. There are 81 chairs and 49 are in use. Empty chairs: 81 - 50 + 1 = 32.
4. A shelf has 74 books. 36 are loaned out. Remaining: 74 - 30 - 6 = 38.
5. A pond had 90 frogs and 47 hopped away. Remaining: 90 - 50 + 3 = 43.
Mental Math Within 100
★ Part A: Multiple Choice
Circle the best answer for each question.
1. What is the best mental step for 52 - 28?
A) 52 - 30 + 2
B) 52 - 30 - 2
C) 52 + 30 - 2
D) 52 - 20 - 8 by ones
2. To solve 63 - 27 by counting up, what is the first friendly jump?
A) From 27 to 30
B) From 27 to 50
C) From 27 to 27
D) From 27 to 63
3. Which strategy works best for 81 - 49?
A) 81 - 50 + 1
B) 81 - 50 - 1
C) 81 + 50 - 1
D) 81 - 40 - 9 by ones
4. Which is the best break-apart for 74 - 36?
A) 74 - 30 - 6
B) 74 - 6 - 30
C) 74 + 30 - 6
D) 74 - 36 on fingers
★ Part B: Fill in the Blank
Write the correct answer on each line.
1) A box has 52 crayons. 28 are used. Remaining crayons: 52 - 30 + 2 = 24.
2) A bag has 63 beads and 27 fall out. Count up 3 to 30, then 30 to 60, then 3 to 63. Beads lost: 36.
3) There are 81 chairs and 49 are in use. Empty chairs: 81 - 50 + 1 = 32.
4) A shelf has 74 books. 36 are loaned out. Remaining: 74 - 30 - 6 = 38.
5) A pond had 90 frogs and 47 hopped away. Remaining: 90 - 50 + 3 = 43.
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9 Questions
12-18 minutes
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