Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 774 · 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 × 30 =
2. 2.25 × 12 =
3. 3.25 × 22 =
4. 4.15 × 38 =
5. 5.32 × 15 =
6. 6.28 × 55 =
7. 7.26 × 65 =
8. 8.25 × 28 =
9. 9.25 × 28 =
10. 10.65 × 28 =
11. 11.125 × 22 =
12. 12.30 × 35 =
13. 13.20 × 125 =
14. 14.35 × 8 =
15. 15.16 × 45 =
16. 16.14 × 65 =
17. 17.45 × 40 =
18. 18.40 × 65 =
19. 19.55 × 34 =
20. 20.25 × 10 =
21. 21.16 × 55 =
22. 22.65 × 24 =
23. 23.18 × 125 =
24. 24.55 × 24 =
25. 25.30 × 65 =
26. 26.32 × 125 =
27. 27.25 × 40 =
28. 28.16 × 15 =
29. 29.15 × 22 =
30. 30.26 × 25 =
31. 31.28 × 55 =
32. 32.26 × 45 =
33. 33.65 × 36 =
34. 34.75 × 30 =
35. 35.18 × 65 =
36. 36.65 × 36 =
37. 37.8 × 15 =
38. 38.35 × 34 =
39. 39.25 × 26 =
40. 40.6 × 65 =

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