Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 497 · 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. 1.24 × 55 =
2. 2.18 × 55 =
3. 3.15 × 32 =
4. 4.32 × 125 =
5. 5.65 × 20 =
6. 6.35 × 8 =
7. 7.12 × 45 =
8. 8.35 × 32 =
9. 9.30 × 125 =
10. 10.65 × 26 =
11. 11.65 × 32 =
12. 12.18 × 75 =
13. 13.38 × 75 =
14. 14.18 × 55 =
15. 15.25 × 20 =
16. 16.65 × 14 =
17. 17.10 × 35 =
18. 18.125 × 26 =
19. 19.15 × 18 =
20. 20.24 × 15 =
21. 21.28 × 75 =
22. 22.10 × 25 =
23. 23.45 × 22 =
24. 24.16 × 75 =
25. 25.15 × 8 =
26. 26.38 × 125 =
27. 27.18 × 25 =
28. 28.35 × 22 =
29. 29.75 × 18 =
30. 30.25 × 40 =
31. 31.25 × 14 =
32. 32.26 × 65 =
33. 33.65 × 20 =
34. 34.15 × 12 =
35. 35.38 × 125 =
36. 36.25 × 10 =
37. 37.65 × 32 =
38. 38.45 × 26 =
39. 39.16 × 75 =
40. 40.25 × 6 =

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