Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 551 · 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. 1.6 × 45 =
2. 2.55 × 40 =
3. 3.14 × 65 =
4. 4.15 × 18 =
5. 5.125 × 34 =
6. 6.10 × 35 =
7. 7.18 × 65 =
8. 8.30 × 25 =
9. 9.45 × 38 =
10. 10.75 × 18 =
11. 11.55 × 12 =
12. 12.38 × 65 =
13. 13.22 × 65 =
14. 14.10 × 125 =
15. 15.34 × 15 =
16. 16.35 × 14 =
17. 17.24 × 125 =
18. 18.75 × 8 =
19. 19.34 × 125 =
20. 20.75 × 34 =
21. 21.15 × 28 =
22. 22.45 × 36 =
23. 23.34 × 35 =
24. 24.6 × 35 =
25. 25.25 × 14 =
26. 26.15 × 36 =
27. 27.6 × 45 =
28. 28.45 × 30 =
29. 29.6 × 25 =
30. 30.45 × 26 =
31. 31.55 × 38 =
32. 32.40 × 35 =
33. 33.25 × 38 =
34. 34.65 × 20 =
35. 35.18 × 35 =
36. 36.18 × 15 =
37. 37.25 × 12 =
38. 38.75 × 34 =
39. 39.10 × 15 =
40. 40.36 × 65 =

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