Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 640 · 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. 1.35 × 32 =
2. 2.10 × 15 =
3. 3.55 × 34 =
4. 4.65 × 32 =
5. 5.34 × 65 =
6. 6.15 × 18 =
7. 7.45 × 20 =
8. 8.10 × 75 =
9. 9.15 × 36 =
10. 10.8 × 55 =
11. 11.36 × 125 =
12. 12.6 × 15 =
13. 13.55 × 18 =
14. 14.15 × 38 =
15. 15.35 × 6 =
16. 16.16 × 65 =
17. 17.12 × 55 =
18. 18.16 × 65 =
19. 19.16 × 55 =
20. 20.40 × 55 =
21. 21.10 × 35 =
22. 22.55 × 22 =
23. 23.15 × 40 =
24. 24.65 × 10 =
25. 25.75 × 30 =
26. 26.45 × 30 =
27. 27.55 × 12 =
28. 28.10 × 35 =
29. 29.125 × 12 =
30. 30.22 × 25 =
31. 31.35 × 30 =
32. 32.25 × 12 =
33. 33.22 × 25 =
34. 34.8 × 35 =
35. 35.32 × 15 =
36. 36.40 × 125 =
37. 37.40 × 65 =
38. 38.22 × 75 =
39. 39.38 × 55 =
40. 40.18 × 25 =

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