Let's solve the subtraction problems on this worksheet step by step. The task is to
subtract whole tens (like 10, 20, 30, etc.) from
3-digit numbers.
We'll go through each problem and explain how to solve it.
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🔢 Understanding the Concept
When subtracting a multiple of ten (e.g., 20, 60, 90) from a 3-digit number:
- You can break down the subtraction into simpler steps.
- Subtract the tens part directly from the hundreds and tens place of the number.
- For example:
$ 692 - 20 $ → Think: $ 692 - 20 = 672 $
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✔ Now, let's solve each problem:
1.
692 - 20
$ 692 - 20 = 672 $
*(Subtract 20 from 692: 92 - 20 = 72, so 672)*
2.
509 - 60
$ 509 - 60 = 449 $
*(509 - 60: 09 - 60 can't work, so borrow: 509 - 60 = 449)*
3.
496 - 90
$ 496 - 90 = 406 $
*(496 - 90: 96 - 90 = 6, so 400 + 6 = 406)*
4.
194 - 10
$ 194 - 10 = 184 $
*(Just remove 10: 194 - 10 = 184)*
5.
380 - 10
$ 380 - 10 = 370 $
*(Simple: 380 - 10 = 370)*
6.
594 - 80
$ 594 - 80 = 514 $
*(594 - 80: 94 - 80 = 14 → 500 + 14 = 514)*
7.
474 - 40
$ 474 - 40 = 434 $
*(474 - 40 = 434)*
8.
218 - 10
$ 218 - 10 = 208 $
*(218 - 10 = 208)*
9.
484 - 10
$ 484 - 10 = 474 $
*(484 - 10 = 474)*
10.
416 - 30
$ 416 - 30 = 386 $
*(416 - 30: 16 - 30 can't, so 416 - 30 = 386)*
11.
59 - 20
$ 59 - 20 = 39 $
*(This is not a 3-digit number, but still valid: 59 - 20 = 39)*
12.
479 - 20
$ 479 - 20 = 459 $
*(479 - 20 = 459)*
13.
776 - 10
$ 776 - 10 = 766 $
*(776 - 10 = 766)*
14.
676 - 50
$ 676 - 50 = 626 $
*(676 - 50: 76 - 50 = 26 → 600 + 26 = 626)*
15.
712 - 10
$ 712 - 10 = 702 $
*(712 - 10 = 702)*
16.
406 - 70
$ 406 - 70 = 336 $
*(406 - 70: 06 - 70 → borrow: 406 - 70 = 336)*
17.
383 - 60
$ 383 - 60 = 323 $
*(383 - 60: 83 - 60 = 23 → 300 + 23 = 323)*
18.
904 - 80
$ 904 - 80 = 824 $
*(904 - 80: 04 - 80 → borrow: 904 - 80 = 824)*
19.
465 - 90
$ 465 - 90 = 375 $
*(465 - 90: 65 - 90 → borrow: 465 - 90 = 375)*
20.
944 - 30
$ 944 - 30 = 914 $
*(944 - 30 = 914)*
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✔ Final Answers:
1. 672
2. 449
3. 406
4. 184
5. 370
6. 514
7. 434
8. 208
9. 474
10. 386
11. 39
12. 459
13. 766
14. 626
15. 702
16. 336
17. 323
18. 824
19. 375
20. 914
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📝 Tips for Students:
- When subtracting multiples of 10, focus on the
tens digit.
- If the ones digit is small, you may need to
borrow from the hundreds.
- Always check your answer by adding: e.g., if $ 692 - 20 = 672 $, then $ 672 + 20 = 692 $ — correct!
Let me know if you'd like this as a printable PDF or with visual explanations!
Parent Tip: Review the logic above to help your child master the concept of subtraction worksheet grade 3 pdf.
