Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 812 · 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. 2.12 × 15 =
3. 3.32 × 55 =
4. 4.125 × 10 =
5. 5.35 × 32 =
6. 6.22 × 55 =
7. 7.125 × 34 =
8. 8.15 × 16 =
9. 9.55 × 30 =
10. 10.75 × 26 =
11. 11.20 × 65 =
12. 12.14 × 25 =
13. 13.20 × 75 =
14. 14.25 × 28 =
15. 15.16 × 75 =
16. 16.10 × 75 =
17. 17.14 × 45 =
18. 18.55 × 26 =
19. 19.55 × 26 =
20. 20.32 × 45 =
21. 21.125 × 36 =
22. 22.65 × 16 =
23. 23.38 × 35 =
24. 24.30 × 125 =
25. 25.24 × 75 =
26. 26.38 × 45 =
27. 27.65 × 10 =
28. 28.65 × 26 =
29. 29.15 × 34 =
30. 30.20 × 65 =
31. 31.75 × 34 =
32. 32.30 × 15 =
33. 33.75 × 22 =
34. 34.35 × 10 =
35. 35.55 × 28 =
36. 36.65 × 38 =
37. 37.35 × 34 =
38. 38.8 × 45 =
39. 39.24 × 75 =
40. 40.55 × 6 =

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