Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 421 · 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. 1.40 × 15 =
2. 2.22 × 45 =
3. 3.35 × 12 =
4. 4.16 × 65 =
5. 5.6 × 75 =
6. 6.55 × 30 =
7. 7.45 × 28 =
8. 8.65 × 28 =
9. 9.25 × 6 =
10. 10.65 × 8 =
11. 11.15 × 20 =
12. 12.15 × 38 =
13. 13.65 × 28 =
14. 14.25 × 32 =
15. 15.40 × 25 =
16. 16.35 × 40 =
17. 17.55 × 26 =
18. 18.75 × 40 =
19. 19.24 × 55 =
20. 20.26 × 45 =
21. 21.8 × 25 =
22. 22.10 × 45 =
23. 23.24 × 65 =
24. 24.15 × 32 =
25. 25.55 × 18 =
26. 26.65 × 20 =
27. 27.32 × 65 =
28. 28.25 × 8 =
29. 29.8 × 65 =
30. 30.24 × 15 =
31. 31.10 × 15 =
32. 32.8 × 45 =
33. 33.25 × 38 =
34. 34.25 × 28 =
35. 35.15 × 40 =
36. 36.65 × 6 =
37. 37.15 × 10 =
38. 38.6 × 15 =
39. 39.12 × 15 =
40. 40.125 × 38 =

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