Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 500 · 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. 1.65 × 10 =
2. 2.55 × 38 =
3. 3.15 × 38 =
4. 4.6 × 45 =
5. 5.15 × 20 =
6. 6.38 × 15 =
7. 7.12 × 65 =
8. 8.6 × 25 =
9. 9.20 × 15 =
10. 10.28 × 35 =
11. 11.36 × 45 =
12. 12.45 × 36 =
13. 13.45 × 30 =
14. 14.14 × 65 =
15. 15.6 × 15 =
16. 16.55 × 40 =
17. 17.12 × 15 =
18. 18.65 × 34 =
19. 19.25 × 6 =
20. 20.32 × 15 =
21. 21.8 × 25 =
22. 22.45 × 36 =
23. 23.32 × 65 =
24. 24.35 × 14 =
25. 25.32 × 25 =
26. 26.10 × 45 =
27. 27.25 × 26 =
28. 28.20 × 65 =
29. 29.22 × 65 =
30. 30.40 × 75 =
31. 31.10 × 125 =
32. 32.55 × 18 =
33. 33.45 × 24 =
34. 34.15 × 28 =
35. 35.45 × 22 =
36. 36.45 × 12 =
37. 37.6 × 35 =
38. 38.10 × 125 =
39. 39.45 × 40 =
40. 40.55 × 22 =

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