Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 610 · 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. 1.55 × 20 =
2. 2.55 × 6 =
3. 3.125 × 18 =
4. 4.20 × 35 =
5. 5.45 × 16 =
6. 6.8 × 75 =
7. 7.45 × 14 =
8. 8.14 × 55 =
9. 9.16 × 45 =
10. 10.45 × 24 =
11. 11.34 × 45 =
12. 12.28 × 65 =
13. 13.8 × 15 =
14. 14.12 × 55 =
15. 15.65 × 26 =
16. 16.35 × 6 =
17. 17.125 × 8 =
18. 18.55 × 34 =
19. 19.32 × 15 =
20. 20.125 × 32 =
21. 21.125 × 36 =
22. 22.28 × 15 =
23. 23.65 × 26 =
24. 24.25 × 10 =
25. 25.26 × 15 =
26. 26.75 × 32 =
27. 27.25 × 36 =
28. 28.36 × 65 =
29. 29.25 × 18 =
30. 30.75 × 34 =
31. 31.65 × 26 =
32. 32.6 × 75 =
33. 33.45 × 18 =
34. 34.8 × 25 =
35. 35.45 × 16 =
36. 36.45 × 22 =
37. 37.55 × 34 =
38. 38.30 × 125 =
39. 39.18 × 65 =
40. 40.10 × 55 =

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