Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 546 · 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 × 18 =
2. 2.15 × 28 =
3. 3.15 × 32 =
4. 4.38 × 35 =
5. 5.36 × 35 =
6. 6.35 × 10 =
7. 7.25 × 16 =
8. 8.55 × 10 =
9. 9.45 × 32 =
10. 10.34 × 15 =
11. 11.30 × 25 =
12. 12.14 × 45 =
13. 13.75 × 32 =
14. 14.45 × 14 =
15. 15.125 × 38 =
16. 16.32 × 45 =
17. 17.75 × 34 =
18. 18.45 × 12 =
19. 19.125 × 8 =
20. 20.65 × 26 =
21. 21.15 × 22 =
22. 22.22 × 75 =
23. 23.12 × 45 =
24. 24.14 × 75 =
25. 25.55 × 32 =
26. 26.15 × 32 =
27. 27.75 × 26 =
28. 28.12 × 125 =
29. 29.55 × 14 =
30. 30.8 × 25 =
31. 31.36 × 25 =
32. 32.18 × 65 =
33. 33.16 × 65 =
34. 34.25 × 30 =
35. 35.125 × 12 =
36. 36.25 × 22 =
37. 37.35 × 20 =
38. 38.35 × 24 =
39. 39.16 × 75 =
40. 40.25 × 20 =

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