Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 639 · 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. 2.125 × 22 =
3. 3.125 × 32 =
4. 4.65 × 12 =
5. 5.6 × 125 =
6. 6.25 × 18 =
7. 7.15 × 14 =
8. 8.20 × 55 =
9. 9.65 × 32 =
10. 10.38 × 35 =
11. 11.18 × 65 =
12. 12.15 × 8 =
13. 13.15 × 40 =
14. 14.15 × 18 =
15. 15.36 × 55 =
16. 16.14 × 35 =
17. 17.34 × 65 =
18. 18.65 × 22 =
19. 19.55 × 38 =
20. 20.6 × 15 =
21. 21.55 × 38 =
22. 22.6 × 65 =
23. 23.32 × 35 =
24. 24.28 × 35 =
25. 25.75 × 32 =
26. 26.65 × 26 =
27. 27.55 × 20 =
28. 28.125 × 38 =
29. 29.75 × 8 =
30. 30.65 × 38 =
31. 31.45 × 22 =
32. 32.15 × 12 =
33. 33.45 × 24 =
34. 34.35 × 22 =
35. 35.125 × 22 =
36. 36.28 × 35 =
37. 37.8 × 65 =
38. 38.22 × 65 =
39. 39.35 × 34 =
40. 40.28 × 35 =

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