Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 292 · 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. 1.45 × 20 =
2. 2.10 × 65 =
3. 3.125 × 40 =
4. 4.15 × 6 =
5. 5.24 × 125 =
6. 6.20 × 75 =
7. 7.20 × 55 =
8. 8.28 × 125 =
9. 9.36 × 25 =
10. 10.15 × 16 =
11. 11.10 × 55 =
12. 12.25 × 40 =
13. 13.45 × 18 =
14. 14.25 × 16 =
15. 15.15 × 24 =
16. 16.65 × 16 =
17. 17.36 × 65 =
18. 18.14 × 55 =
19. 19.30 × 25 =
20. 20.14 × 65 =
21. 21.12 × 65 =
22. 22.10 × 65 =
23. 23.10 × 125 =
24. 24.75 × 10 =
25. 25.14 × 55 =
26. 26.125 × 22 =
27. 27.35 × 24 =
28. 28.8 × 45 =
29. 29.14 × 75 =
30. 30.25 × 16 =
31. 31.40 × 25 =
32. 32.8 × 55 =
33. 33.65 × 40 =
34. 34.65 × 8 =
35. 35.40 × 65 =
36. 36.36 × 45 =
37. 37.35 × 14 =
38. 38.15 × 28 =
39. 39.55 × 38 =
40. 40.26 × 65 =

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