Let's solve each problem step by step, converting units where necessary and simplifying to
compound units (e.g., km and m, or m and cm) when possible.
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Part 1: Kilometers and Meters
We’ll convert everything to meters first, then convert back to compound units.
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1.
8 km 300 m + 900 m
→ 8 km = 8,000 m
→ 8,000 + 300 + 900 = 9,200 m
→ 9,200 m =
9 km 200 m ✔
2.
2 km 120 m - 980 m
→ 2 km = 2,000 m → 2,000 + 120 = 2,120 m
→ 2,120 - 980 = 1,140 m
→ 1,140 m =
1 km 140 m ✔
3.
1 km 200 m - 500 m
→ 1 km = 1,000 m → 1,000 + 200 = 1,200 m
→ 1,200 - 500 = 700 m
→
700 m ✔
4.
876 m + 1 km 500 m
→ 1 km 500 m = 1,500 m
→ 876 + 1,500 = 2,376 m
→ 2,376 m =
2 km 376 m ✔
5.
2 km 50 m - 950 m
→ 2 km 50 m = 2,050 m
→ 2,050 - 950 = 1,100 m
→ 1,100 m =
1 km 100 m ✔
6.
1,540 m + 670 m
→ 1,540 + 670 = 2,210 m
→
2 km 210 m ✔
7.
7 km 500 m + 500 m
→ 7 km 500 m = 7,500 m
→ 7,500 + 500 = 8,000 m
→
8 km ✔
8.
4 km 4 m - 3,400 m
→ 4 km 4 m = 4,004 m
→ 4,004 - 3,400 = 604 m
→
604 m ✔
9.
3 km 725 m + 980 m
→ 3 km 725 m = 3,725 m
→ 3,725 + 980 = 4,705 m
→ 4,705 m =
4 km 705 m ✔
10.
1,480 m + 1,520 m
→ 1,480 + 1,520 = 3,000 m
→
3 km ✔
11.
876 m + 943 m
→ 876 + 943 = 1,819 m
→
1 km 819 m ✔
12.
2 km 900 m + 900 m
→ 2 km 900 m = 2,900 m
→ 2,900 + 900 = 3,800 m
→
3 km 800 m ✔
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Part 2: Meters and Centimeters
Convert to centimeters, compute, then convert back.
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13.
6 m 30 cm + 200 cm
→ 6 m = 600 cm → 600 + 30 = 630 cm
→ 630 + 200 = 830 cm
→ 830 cm =
8 m 30 cm ✔
14.
2 m 12 cm - 98 cm
→ 2 m = 200 cm → 200 + 12 = 212 cm
→ 212 - 98 = 114 cm
→ 114 cm =
1 m 14 cm ✔
15.
1 m 20 cm - 50 cm
→ 1 m 20 cm = 120 cm
→ 120 - 50 = 70 cm
→
70 cm ✔
16.
876 cm - 1 m 50 cm
→ 1 m 50 cm = 150 cm
→ 876 - 150 = 726 cm
→
7 m 26 cm ✔
17.
2 m 50 cm + 650 cm
→ 2 m 50 cm = 250 cm
→ 250 + 650 = 900 cm
→
9 m ✔
18.
540 cm + 270 cm
→ 540 + 270 = 810 cm
→
8 m 10 cm ✔
19.
7 m 20 cm - 500 cm
→ 7 m 20 cm = 720 cm
→ 720 - 500 = 220 cm
→
2 m 20 cm ✔
20.
4 m 4 cm + 396 cm
→ 4 m 4 cm = 404 cm
→ 404 + 396 = 800 cm
→
8 m ✔
21.
3 m 75 cm + 298 cm
→ 3 m 75 cm = 375 cm
→ 375 + 298 = 673 cm
→ 673 cm =
6 m 73 cm ✔
22.
180 cm - 79 cm
→ 180 - 79 = 101 cm
→
1 m 1 cm ✔
23.
876 cm + 43 cm
→ 876 + 43 = 919 cm
→
9 m 19 cm ✔
24.
2 m 90 cm + 444 cm
→ 2 m 90 cm = 290 cm
→ 290 + 444 = 734 cm
→ 734 cm =
7 m 34 cm ✔
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✔ Final Answers:
####
Kilometers and Meters:
1. 9 km 200 m
2. 1 km 140 m
3. 700 m
4. 2 km 376 m
5. 1 km 100 m
6. 2 km 210 m
7. 8 km
8. 604 m
9. 4 km 705 m
10. 3 km
11. 1 km 819 m
12. 3 km 800 m
####
Meters and Centimeters:
13. 8 m 30 cm
14. 1 m 14 cm
15. 70 cm
16. 7 m 26 cm
17. 9 m
18. 8 m 10 cm
19. 2 m 20 cm
20. 8 m
21. 6 m 73 cm
22. 1 m 1 cm
23. 9 m 19 cm
24. 7 m 34 cm
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✔ All answers are in
compound units where possible. Let me know if you'd like this formatted as a printable answer key!
Parent Tip: Review the logic above to help your child master the concept of addition length worksheet.
