Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 429 · 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 × 16 =
2. 2.20 × 25 =
3. 3.15 × 8 =
4. 4.15 × 18 =
5. 5.18 × 65 =
6. 6.65 × 16 =
7. 7.26 × 125 =
8. 8.55 × 28 =
9. 9.6 × 75 =
10. 10.6 × 45 =
11. 11.125 × 20 =
12. 12.40 × 65 =
13. 13.65 × 28 =
14. 14.25 × 18 =
15. 15.65 × 24 =
16. 16.10 × 15 =
17. 17.8 × 125 =
18. 18.15 × 24 =
19. 19.75 × 10 =
20. 20.25 × 26 =
21. 21.30 × 15 =
22. 22.55 × 10 =
23. 23.20 × 125 =
24. 24.15 × 20 =
25. 25.22 × 45 =
26. 26.8 × 35 =
27. 27.125 × 6 =
28. 28.28 × 15 =
29. 29.25 × 14 =
30. 30.34 × 65 =
31. 31.125 × 14 =
32. 32.45 × 18 =
33. 33.38 × 35 =
34. 34.40 × 45 =
35. 35.26 × 75 =
36. 36.18 × 125 =
37. 37.14 × 15 =
38. 38.65 × 40 =
39. 39.12 × 45 =
40. 40.35 × 8 =

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