The Hard 1 worksheet, Think & Solve: Regrouping Challenges, pushes second graders to reason about strategy. Part A has four multiple-choice questions that ask students to compute two-digit sums and identify when regrouping is or is not required, deepening their understanding of the algorithm. Part B includes five fill-in-the-blank addition and subtraction problems, almost all involving regrouping across the tens place.
This sheet builds careful, deliberate thinking before answering.
Style:
Two-Digit Addition & Subtraction
Part A: Multiple Choice
Circle the best answer for each question.
1. What is 56 + 37?
A) 83
B) 93
C) 82
D) 92
2. When you subtract 74 − 48, what do you need to do first?
A) Subtract the tens first
B) Regroup 1 ten as 10 ones
C) Add the ones digits
D) Borrow from the hundreds
3. Which problem does NOT need regrouping?
A) 45 + 38
B) 62 + 21
C) 57 + 26
D) 39 + 43
4. What is 80 − 35?
A) 55
B) 45
C) 35
D) 65
Part B: Fill in the Blank
Write the correct answer on each line.
1. 67 + 25 = 92.
2. 83 − 46 = 37.
3. 39 + 48 = 87.
4. 72 − 55 = 17.
5. 54 + 29 = 83.
Two-Digit Addition & Subtraction
★ Part A: Multiple Choice
Circle the best answer for each question.
1. What is 56 + 37?
A) 83
B) 93
C) 82
D) 92
2. When you subtract 74 − 48, what do you need to do first?
A) Subtract the tens first
B) Regroup 1 ten as 10 ones
C) Add the ones digits
D) Borrow from the hundreds
3. Which problem does NOT need regrouping?
A) 45 + 38
B) 62 + 21
C) 57 + 26
D) 39 + 43
4. What is 80 − 35?
A) 55
B) 45
C) 35
D) 65
★ Part B: Fill in the Blank
Write the correct answer on each line.
1) 67 + 25 = 92.
2) 83 − 46 = 37.
3) 39 + 48 = 87.
4) 72 − 55 = 17.
5) 54 + 29 = 83.
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