Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 248 · 40 questions

How it works (Double and halve): Find the number ending in 5 and the even number. Double the one ending in 5; halve the even one. Repeat while it helps (25 → 50 → 100), then multiply.

1. 1.25 × 22 =
2. 2.15 × 20 =
3. 3.32 × 65 =
4. 4.25 × 32 =
5. 5.25 × 32 =
6. 6.8 × 45 =
7. 7.125 × 30 =
8. 8.125 × 8 =
9. 9.6 × 75 =
10. 10.32 × 15 =
11. 11.12 × 35 =
12. 12.10 × 125 =
13. 13.15 × 38 =
14. 14.65 × 10 =
15. 15.15 × 12 =
16. 16.10 × 65 =
17. 17.125 × 18 =
18. 18.25 × 28 =
19. 19.55 × 38 =
20. 20.22 × 25 =
21. 21.125 × 6 =
22. 22.15 × 20 =
23. 23.30 × 25 =
24. 24.65 × 38 =
25. 25.15 × 14 =
26. 26.6 × 35 =
27. 27.25 × 32 =
28. 28.75 × 14 =
29. 29.15 × 36 =
30. 30.45 × 28 =
31. 31.55 × 38 =
32. 32.8 × 55 =
33. 33.65 × 40 =
34. 34.75 × 8 =
35. 35.15 × 14 =
36. 36.25 × 36 =
37. 37.65 × 12 =
38. 38.20 × 25 =
39. 39.20 × 25 =
40. 40.35 × 8 =

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