Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 724 · 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. 1.6 × 15 =
2. 2.36 × 45 =
3. 3.14 × 125 =
4. 4.16 × 55 =
5. 5.65 × 26 =
6. 6.55 × 8 =
7. 7.36 × 45 =
8. 8.25 × 34 =
9. 9.125 × 26 =
10. 10.55 × 10 =
11. 11.45 × 32 =
12. 12.34 × 55 =
13. 13.125 × 30 =
14. 14.8 × 65 =
15. 15.25 × 32 =
16. 16.65 × 12 =
17. 17.30 × 65 =
18. 18.25 × 28 =
19. 19.45 × 6 =
20. 20.14 × 15 =
21. 21.12 × 125 =
22. 22.24 × 125 =
23. 23.55 × 28 =
24. 24.15 × 36 =
25. 25.34 × 65 =
26. 26.8 × 75 =
27. 27.25 × 32 =
28. 28.45 × 38 =
29. 29.15 × 38 =
30. 30.10 × 45 =
31. 31.8 × 65 =
32. 32.38 × 35 =
33. 33.65 × 16 =
34. 34.55 × 24 =
35. 35.16 × 15 =
36. 36.32 × 35 =
37. 37.45 × 6 =
38. 38.35 × 28 =
39. 39.20 × 55 =
40. 40.45 × 14 =

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