Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 284 · 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 × 16 =
2. 2.20 × 25 =
3. 3.6 × 35 =
4. 4.20 × 75 =
5. 5.16 × 15 =
6. 6.16 × 65 =
7. 7.28 × 25 =
8. 8.25 × 30 =
9. 9.8 × 25 =
10. 10.75 × 6 =
11. 11.75 × 6 =
12. 12.18 × 55 =
13. 13.25 × 10 =
14. 14.22 × 25 =
15. 15.10 × 25 =
16. 16.18 × 125 =
17. 17.36 × 55 =
18. 18.30 × 125 =
19. 19.16 × 125 =
20. 20.24 × 15 =
21. 21.45 × 8 =
22. 22.65 × 36 =
23. 23.55 × 10 =
24. 24.12 × 15 =
25. 25.25 × 6 =
26. 26.75 × 16 =
27. 27.12 × 35 =
28. 28.10 × 25 =
29. 29.18 × 55 =
30. 30.75 × 40 =
31. 31.24 × 35 =
32. 32.30 × 25 =
33. 33.25 × 16 =
34. 34.15 × 12 =
35. 35.75 × 14 =
36. 36.125 × 6 =
37. 37.125 × 26 =
38. 38.55 × 12 =
39. 39.15 × 38 =
40. 40.8 × 75 =

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