Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 179 · 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 × 20 =
2. 2.6 × 15 =
3. 3.40 × 65 =
4. 4.45 × 30 =
5. 5.12 × 55 =
6. 6.8 × 45 =
7. 7.15 × 18 =
8. 8.45 × 10 =
9. 9.25 × 36 =
10. 10.8 × 35 =
11. 11.15 × 18 =
12. 12.65 × 14 =
13. 13.65 × 16 =
14. 14.75 × 22 =
15. 15.55 × 12 =
16. 16.10 × 35 =
17. 17.6 × 25 =
18. 18.55 × 14 =
19. 19.125 × 22 =
20. 20.25 × 20 =
21. 21.18 × 15 =
22. 22.65 × 16 =
23. 23.14 × 15 =
24. 24.125 × 20 =
25. 25.40 × 45 =
26. 26.25 × 34 =
27. 27.25 × 32 =
28. 28.125 × 24 =
29. 29.30 × 65 =
30. 30.65 × 16 =
31. 31.16 × 25 =
32. 32.22 × 65 =
33. 33.55 × 12 =
34. 34.12 × 15 =
35. 35.8 × 15 =
36. 36.35 × 24 =
37. 37.75 × 6 =
38. 38.6 × 15 =
39. 39.16 × 15 =
40. 40.75 × 40 =

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