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Step-by-step solution for: Pin on Educational craft
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Show Answer Key & Explanations
Step-by-step solution for: Pin on Educational craft
Let’s solve each subtraction problem step by step. We’ll go one at a time, making sure we subtract correctly — starting from the rightmost digit (ones place) and moving left. If we need to borrow, we’ll do that carefully.
---
1. 33 - 21
Ones: 3 - 1 = 2
Tens: 3 - 2 = 1
→ 12
2. 67 - 32
Ones: 7 - 2 = 5
Tens: 6 - 3 = 3
→ 35
3. 98 - 30
Ones: 8 - 0 = 8
Tens: 9 - 3 = 6
→ 68
4. 19 - 15
Ones: 9 - 5 = 4
Tens: 1 - 1 = 0 → don’t write leading zero
→ 4
5. 55 - 44
Ones: 5 - 4 = 1
Tens: 5 - 4 = 1
→ 11
6. 63 - 37
Ones: 3 - 7 → can’t do! Borrow from tens.
63 becomes 5 tens and 13 ones.
13 - 7 = 6
Tens: 5 - 3 = 2
→ 26
7. 22 - 18
Ones: 2 - 8 → can’t do! Borrow.
22 becomes 1 ten and 12 ones.
12 - 8 = 4
Tens: 1 - 1 = 0
→ 4
8. 84 - 60
Ones: 4 - 0 = 4
Tens: 8 - 6 = 2
→ 24
9. 69 - 51
Ones: 9 - 1 = 8
Tens: 6 - 5 = 1
→ 18
10. 75 - 48
Ones: 5 - 8 → can’t do! Borrow.
75 becomes 6 tens and 15 ones.
15 - 8 = 7
Tens: 6 - 4 = 2
→ 27
11. 97 - 72
Ones: 7 - 2 = 5
Tens: 9 - 7 = 2
→ 25
12. 49 - 25
Ones: 9 - 5 = 4
Tens: 4 - 2 = 2
→ 24
13. 745 - 123
Ones: 5 - 3 = 2
Tens: 4 - 2 = 2
Hundreds: 7 - 1 = 6
→ 622
14. 200 - 170
Ones: 0 - 0 = 0
Tens: 0 - 7 → can’t do! Borrow from hundreds.
200 becomes 1 hundred, 9 tens, 10 ones? Wait — better way:
Think of it as 200 - 170 = (200 - 100) - 70 = 100 - 70 = 30
Or column-wise:
Ones: 0 - 0 = 0
Tens: 0 - 7 → borrow from hundreds. Hundreds become 1, tens become 10. But 10 - 7 = 3? Wait — actually, since we’re subtracting 170, let’s line up:
200
- 170
------
Start from right:
Ones: 0 - 0 = 0
Tens: 0 - 7 → borrow from hundreds. So hundreds digit 2 becomes 1, tens become 10. Now 10 - 7 = 3
Hundreds: 1 - 1 = 0
→ 30
15. 335 - 212
Ones: 5 - 2 = 3
Tens: 3 - 1 = 2
Hundreds: 3 - 2 = 1
→ 123
16. 888 - 406
Ones: 8 - 6 = 2
Tens: 8 - 0 = 8
Hundreds: 8 - 4 = 4
→ 482
17. 663 - 151
Ones: 3 - 1 = 2
Tens: 6 - 5 = 1
Hundreds: 6 - 1 = 5
→ 512
18. 432 - 115
Ones: 2 - 5 → can’t do! Borrow.
432 → 4 hundreds, 2 tens, 12 ones? Wait — better:
Borrow from tens: tens is 3, so make it 2, ones become 12.
12 - 5 = 7
Tens: 2 - 1 = 1
Hundreds: 4 - 1 = 3
→ 317
Wait — let me double-check:
432
-115
----
Ones: 2 < 5 → borrow from tens. Tens digit is 3 → becomes 2, ones become 12. 12 - 5 = 7
Tens: 2 (after borrow) - 1 = 1
Hundreds: 4 - 1 = 3
Yes → 317
19. 534 - 321
Ones: 4 - 1 = 3
Tens: 3 - 2 = 1
Hundreds: 5 - 3 = 2
→ 213
20. 940 - 267
Ones: 0 - 7 → can’t do! Borrow from tens.
But tens is 4 → becomes 3, ones become 10.
10 - 7 = 3
Tens: 3 (after borrow) - 6 → can’t do! Borrow from hundreds.
Hundreds: 9 → becomes 8, tens become 13.
13 - 6 = 7
Hundreds: 8 - 2 = 6
→ 673
Double-check:
940
-267
----
Ones: 0→10 (borrow), 10-7=3
Tens: 4 became 3, then borrow → 13 - 6 = 7
Hundreds: 9 became 8, 8 - 2 = 6
Yes → 673
---
Final Answer:
1. 12
2. 35
3. 68
4. 4
5. 11
6. 26
7. 4
8. 24
9. 18
10. 27
11. 25
12. 24
13. 622
14. 30
15. 123
16. 482
17. 512
18. 317
19. 213
20. 673
---
1. 33 - 21
Ones: 3 - 1 = 2
Tens: 3 - 2 = 1
→ 12
2. 67 - 32
Ones: 7 - 2 = 5
Tens: 6 - 3 = 3
→ 35
3. 98 - 30
Ones: 8 - 0 = 8
Tens: 9 - 3 = 6
→ 68
4. 19 - 15
Ones: 9 - 5 = 4
Tens: 1 - 1 = 0 → don’t write leading zero
→ 4
5. 55 - 44
Ones: 5 - 4 = 1
Tens: 5 - 4 = 1
→ 11
6. 63 - 37
Ones: 3 - 7 → can’t do! Borrow from tens.
63 becomes 5 tens and 13 ones.
13 - 7 = 6
Tens: 5 - 3 = 2
→ 26
7. 22 - 18
Ones: 2 - 8 → can’t do! Borrow.
22 becomes 1 ten and 12 ones.
12 - 8 = 4
Tens: 1 - 1 = 0
→ 4
8. 84 - 60
Ones: 4 - 0 = 4
Tens: 8 - 6 = 2
→ 24
9. 69 - 51
Ones: 9 - 1 = 8
Tens: 6 - 5 = 1
→ 18
10. 75 - 48
Ones: 5 - 8 → can’t do! Borrow.
75 becomes 6 tens and 15 ones.
15 - 8 = 7
Tens: 6 - 4 = 2
→ 27
11. 97 - 72
Ones: 7 - 2 = 5
Tens: 9 - 7 = 2
→ 25
12. 49 - 25
Ones: 9 - 5 = 4
Tens: 4 - 2 = 2
→ 24
13. 745 - 123
Ones: 5 - 3 = 2
Tens: 4 - 2 = 2
Hundreds: 7 - 1 = 6
→ 622
14. 200 - 170
Ones: 0 - 0 = 0
Tens: 0 - 7 → can’t do! Borrow from hundreds.
200 becomes 1 hundred, 9 tens, 10 ones? Wait — better way:
Think of it as 200 - 170 = (200 - 100) - 70 = 100 - 70 = 30
Or column-wise:
Ones: 0 - 0 = 0
Tens: 0 - 7 → borrow from hundreds. Hundreds become 1, tens become 10. But 10 - 7 = 3? Wait — actually, since we’re subtracting 170, let’s line up:
200
- 170
------
Start from right:
Ones: 0 - 0 = 0
Tens: 0 - 7 → borrow from hundreds. So hundreds digit 2 becomes 1, tens become 10. Now 10 - 7 = 3
Hundreds: 1 - 1 = 0
→ 30
15. 335 - 212
Ones: 5 - 2 = 3
Tens: 3 - 1 = 2
Hundreds: 3 - 2 = 1
→ 123
16. 888 - 406
Ones: 8 - 6 = 2
Tens: 8 - 0 = 8
Hundreds: 8 - 4 = 4
→ 482
17. 663 - 151
Ones: 3 - 1 = 2
Tens: 6 - 5 = 1
Hundreds: 6 - 1 = 5
→ 512
18. 432 - 115
Ones: 2 - 5 → can’t do! Borrow.
432 → 4 hundreds, 2 tens, 12 ones? Wait — better:
Borrow from tens: tens is 3, so make it 2, ones become 12.
12 - 5 = 7
Tens: 2 - 1 = 1
Hundreds: 4 - 1 = 3
→ 317
Wait — let me double-check:
432
-115
----
Ones: 2 < 5 → borrow from tens. Tens digit is 3 → becomes 2, ones become 12. 12 - 5 = 7
Tens: 2 (after borrow) - 1 = 1
Hundreds: 4 - 1 = 3
Yes → 317
19. 534 - 321
Ones: 4 - 1 = 3
Tens: 3 - 2 = 1
Hundreds: 5 - 3 = 2
→ 213
20. 940 - 267
Ones: 0 - 7 → can’t do! Borrow from tens.
But tens is 4 → becomes 3, ones become 10.
10 - 7 = 3
Tens: 3 (after borrow) - 6 → can’t do! Borrow from hundreds.
Hundreds: 9 → becomes 8, tens become 13.
13 - 6 = 7
Hundreds: 8 - 2 = 6
→ 673
Double-check:
940
-267
----
Ones: 0→10 (borrow), 10-7=3
Tens: 4 became 3, then borrow → 13 - 6 = 7
Hundreds: 9 became 8, 8 - 2 = 6
Yes → 673
---
Final Answer:
1. 12
2. 35
3. 68
4. 4
5. 11
6. 26
7. 4
8. 24
9. 18
10. 27
11. 25
12. 24
13. 622
14. 30
15. 123
16. 482
17. 512
18. 317
19. 213
20. 673
Parent Tip: Review the logic above to help your child master the concept of fourth grade math worksheets.
