Let’s solve each problem step by step. We’re adding numbers that are broken into parts — like hundreds, tens, and ones (or thousands, hundreds, tens). Just add them up carefully.
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1. 400 + 80 + 7
→ 400 + 80 = 480
→ 480 + 7 =
487
2. 300 + 90 + 4
→ 300 + 90 = 390
→ 390 + 4 =
394
3. 600 + 90
→ 600 + 90 =
690
4. 700 + 50 + 2
→ 700 + 50 = 750
→ 750 + 2 =
752
5. 900 + 80 + 3
→ 900 + 80 = 980
→ 980 + 3 =
983
6. 300 + 9
→ 300 + 9 =
309
7. 200 + 40 + 6
→ 200 + 40 = 240
→ 240 + 6 =
246
8. 500 + 50
→ 500 + 50 =
550
9. 900 + 30 + 3
→ 900 + 30 = 930
→ 930 + 3 =
933
10. 400 + 80
→ 400 + 80 =
480
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Now the second column:
11. 3000 + 800 + 90
→ 3000 + 800 = 3800
→ 3800 + 90 =
3890
12. 7000 + 300 + 7
→ 7000 + 300 = 7300
→ 7300 + 7 =
7307
13. 4000 + 70 + 5
→ 4000 + 70 = 4070
→ 4070 + 5 =
4075
14. 2000 + 600 + 3
→ 2000 + 600 = 2600
→ 2600 + 3 =
2603
15. 5000 + 800 + 90
→ 5000 + 800 = 5800
→ 5800 + 90 =
5890
16. 8000 + 9
→ 8000 + 9 =
8009
17. 1000 + 800 + 70
→ 1000 + 800 = 1800
→ 1800 + 70 =
1870
18. 7000 + 600 + 30
→ 7000 + 600 = 7600
→ 7600 + 30 =
7630
19. 9000 + 300 + 9
→ 9000 + 300 = 9300
→ 9300 + 9 =
9309
20. 4000 + 70 + 2
→ 4000 + 70 = 4070
→ 4070 + 2 =
4072
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Final Answer:
1. 487
2. 394
3. 690
4. 752
5. 983
6. 309
7. 246
8. 550
9. 933
10. 480
11. 3890
12. 7307
13. 4075
14. 2603
15. 5890
16. 8009
17. 1870
18. 7630
19. 9309
20. 4072
Parent Tip: Review the logic above to help your child master the concept of math worksheet for 3rd grade.
