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Subtraction Within 100

Grade 2 · Mathematics · Worksheet 1

  1. 75 - 28 = ? Answer: ______________
  2. 76 - 48 = ? Answer: ______________
  3. 84 - 39 = ? Answer: ______________
  4. Noah had 83 toy cars. Noah lost 22 of them at the park. How many toy cars does Noah still have? Answer: ______________
  5. Liam collected 75 seashells at the beach. He gave 32 seashells to his friend Noah. How many seashells does Liam have left? Answer: ______________
  6. Liam had 75 stickers in his collection. He gave 28 stickers to his friend Noah for his birthday. How many stickers does Liam have left? Answer: ______________
  7. Ava had 92 stickers. Ava gave 25 stickers to a friend. How many stickers does Ava have now? Answer: ______________
  8. 91 - 58 = ? Answer: ______________
  9. 91 - 57 = ? Answer: ______________
  10. 45 - 28 = ? Answer: ______________
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Answer Key & Explanations

Subtraction Within 100 · Grade 2 · Worksheet 1

  1. 75 - 28 = ? Answer: 47 Solution: We are solving 75 - 28. Write the numbers vertically in your mind (align by place value): 75 - 28 Start with the ones column: 5 - 8. Since 5 is smaller than 8, we cannot subtract directly.
    Full step-by-step solution

    We are solving 75 - 28. Step 1: Write the numbers vertically in your mind (align by place value): 75 - 28 Step 2: Start with the ones column: 5 - 8. Since 5 is smaller than 8, we cannot subtract directly. We borrow 1 from the tens column of 75. Step 3: Borrowing 1 from the 7 in the tens column: The 7 becomes 6, and the 5 in the ones column becomes 15 (because 10 + 5 = 15). Now the problem in the ones column is: 15 - 8 = 7. Write down 7 in the ones place of the answer. Step 4: Move to the tens column: We now have 6 (after borrowing) minus 2 = 4. Write down 4 in the tens place of the answer. Step 5: Combine the results: Tens: 4, Ones: 7 → 47. Final answer: 47.

  2. 76 - 48 = ? Answer: 28 Solution: 76 -48 Look at the ones place: 6 - 8. Since 6 is smaller than 8, we need to regroup. Take 1 ten from the 7 tens, leaving 6 tens.
    Full step-by-step solution

    Step 1: Write the problem vertically: 76 -48 --- Step 2: Look at the ones place: 6 - 8. Since 6 is smaller than 8, we need to regroup. Step 3: Take 1 ten from the 7 tens, leaving 6 tens. Add 10 ones to the 6 ones, making 16 ones. Step 4: Now subtract in the ones place: 16 - 8 = 8 Step 5: Subtract in the tens place: 6 - 4 = 2 Step 6: Combine the results: 2 tens and 8 ones = 28 The answer is 28.

  3. 84 - 39 = ? Answer: 45 Solution: 84 -39 Look at the ones place: 4 - 9. Since 4 is smaller than 9, we need to regroup. Take 1 ten from the 8 tens, leaving 7 tens.
    Full step-by-step solution

    Step 1: Write the problem vertically: 84 -39 --- Step 2: Look at the ones place: 4 - 9. Since 4 is smaller than 9, we need to regroup. Step 3: Take 1 ten from the 8 tens, leaving 7 tens. Add 10 ones to the 4 ones, making 14 ones. Step 4: Now subtract in the ones place: 14 - 9 = 5 Step 5: Subtract in the tens place: 7 - 3 = 4 Step 6: Combine the results: 4 tens and 5 ones = 45 The answer is 45.

  4. Noah had 83 toy cars. Noah lost 22 of them at the park. How many toy cars does Noah still have? Answer: 61 Solution: Noah started with 83 toy cars. Subtract the 22 cars that were lost: 83 - 22 = 61. Noah still has 61 toy cars.
    Full step-by-step solution

    Step 1: Noah started with 83 toy cars. Step 2: Subtract the 22 cars that were lost: 83 - 22 = 61. Noah still has 61 toy cars.

  5. Liam collected 75 seashells at the beach. He gave 32 seashells to his friend Noah. How many seashells does Liam have left? Answer: 43 Solution: Liam started with 75 seashells. He gave away 32 seashells to Noah. To find how many he has left, we subtract the seashells he gave away from the seashells he started with.
    Full step-by-step solution

    Liam started with 75 seashells. He gave away 32 seashells to Noah. To find how many he has left, we subtract the seashells he gave away from the seashells he started with. Step 1: Write the subtraction problem. 75 − 32 Step 2: Subtract the ones place: 5 − 2 = 3. Step 3: Subtract the tens place: 7 − 3 = 4. Step 4: Combine the results: 4 tens and 3 ones = 43. So, Liam has 43 seashells left.

  6. Liam had 75 stickers in his collection. He gave 28 stickers to his friend Noah for his birthday. How many stickers does Liam have left? Answer: 47 Solution: Liam starts with 75 stickers. He gives 28 stickers to Noah. That means we need to subtract 28 from 75.
    Full step-by-step solution

    Let's solve this step by step. Step 1: Liam starts with 75 stickers. Step 2: He gives 28 stickers to Noah. That means we need to subtract 28 from 75. Step 3: Write the subtraction: 75 − 28 Step 4: Subtract the ones place first: 5 − 8 — we can't do this without regrouping. So, take 1 ten from the 7 tens (which is 10 ones) and add it to the 5 ones. That makes 7 tens become 6 tens, and 5 ones become 15 ones. Step 5: Now subtract ones place: 15 − 8 = 7 Step 6: Now subtract tens place: 6 − 2 = 4 Step 7: Combine the tens and ones: 4 tens and 7 ones = 47 Step 8: So, Liam has 47 stickers left. Final answer: 47

  7. Ava had 92 stickers. Ava gave 25 stickers to a friend. How many stickers does Ava have now? Answer: 67 Solution: Start with 92 stickers. Subtract the 25 stickers given away: 92 - 25 = 67.
    Full step-by-step solution

    Step 1: Start with 92 stickers. Step 2: Subtract the 25 stickers given away: 92 - 25 = 67. The answer is 67 stickers.

  8. 91 - 58 = ? Answer: 33 Solution: 91 -58 Look at the ones place: 1 - 8. Since 1 is smaller than 8, we need to regroup. Take 1 ten from the 9 tens, leaving 8 tens.
    Full step-by-step solution

    Step 1: Write the problem vertically: 91 -58 --- Step 2: Look at the ones place: 1 - 8. Since 1 is smaller than 8, we need to regroup. Step 3: Take 1 ten from the 9 tens, leaving 8 tens. Add 10 ones to the 1 one, making 11 ones. Step 4: Now subtract in the ones place: 11 - 8 = 3 Step 5: Subtract in the tens place: 8 - 5 = 3 Step 6: Combine the results: 3 tens and 3 ones = 33 The answer is 33.

  9. 91 - 57 = ? Answer: 34 Solution: 91 -57 Look at the ones place: 1 - 7. Since 1 is smaller than 7, we need to regroup. Take 1 ten from the 9 tens, leaving 8 tens.
    Full step-by-step solution

    Step 1: Write the problem vertically: 91 -57 --- Step 2: Look at the ones place: 1 - 7. Since 1 is smaller than 7, we need to regroup. Step 3: Take 1 ten from the 9 tens, leaving 8 tens. Add 10 ones to the 1 one, making 11 ones. Step 4: Now subtract in the ones place: 11 - 7 = 4 Step 5: Subtract in the tens place: 8 - 5 = 3 Step 6: Combine the results: 3 tens and 4 ones = 34 The answer is 34.

  10. 45 - 28 = ? Answer: 17 Solution: 45 - 28 Start with the ones column (rightmost digits): 5 - 8. Since 5 is smaller than 8, we cannot subtract directly. We need to borrow from the tens column.
    Full step-by-step solution

    Let's solve 45 - 28 step-by-step. Step 1: Write the problem vertically in your mind: 45 - 28 Step 2: Start with the ones column (rightmost digits): 5 - 8. Since 5 is smaller than 8, we cannot subtract directly. We need to borrow from the tens column. Step 3: Borrow 1 ten from the 4 in the tens column. The 4 in the tens column becomes 3 (because we took 1 ten away). The 1 ten we borrowed equals 10 ones. We add these 10 ones to the existing 5 ones in the ones column. So now the ones column has: 10 + 5 = 15 ones. Step 4: Now subtract the ones column: 15 - 8 = 7. Write down 7 in the ones place of the answer. Step 5: Move to the tens column. After borrowing, the tens column originally had 4, but now it has 3 (because we borrowed 1 ten for the ones column). So we have 3 - 2 = 1. Write down 1 in the tens place of the answer. Step 6: Combine the digits from tens and ones: The answer is 17. Final check: 45 - 28 = 17 is correct because 17 + 28 = 45. ANSWER: 17