Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 525 · 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 × 8 =
2. 2.15 × 18 =
3. 3.16 × 75 =
4. 4.40 × 35 =
5. 5.55 × 18 =
6. 6.22 × 75 =
7. 7.40 × 15 =
8. 8.6 × 15 =
9. 9.65 × 18 =
10. 10.25 × 38 =
11. 11.14 × 25 =
12. 12.12 × 75 =
13. 13.6 × 15 =
14. 14.25 × 38 =
15. 15.40 × 45 =
16. 16.10 × 45 =
17. 17.75 × 10 =
18. 18.16 × 45 =
19. 19.55 × 12 =
20. 20.40 × 35 =
21. 21.125 × 30 =
22. 22.24 × 55 =
23. 23.65 × 12 =
24. 24.32 × 25 =
25. 25.75 × 24 =
26. 26.12 × 55 =
27. 27.25 × 34 =
28. 28.22 × 125 =
29. 29.8 × 45 =
30. 30.25 × 14 =
31. 31.55 × 16 =
32. 32.15 × 8 =
33. 33.25 × 38 =
34. 34.25 × 10 =
35. 35.15 × 36 =
36. 36.34 × 35 =
37. 37.125 × 30 =
38. 38.32 × 55 =
39. 39.75 × 10 =
40. 40.15 × 16 =

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