Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 522 · 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. 1.30 × 65 =
2. 2.28 × 65 =
3. 3.14 × 25 =
4. 4.75 × 12 =
5. 5.55 × 12 =
6. 6.65 × 22 =
7. 7.15 × 36 =
8. 8.36 × 25 =
9. 9.15 × 36 =
10. 10.14 × 45 =
11. 11.55 × 24 =
12. 12.75 × 32 =
13. 13.45 × 38 =
14. 14.45 × 36 =
15. 15.26 × 55 =
16. 16.16 × 15 =
17. 17.30 × 55 =
18. 18.55 × 6 =
19. 19.36 × 25 =
20. 20.65 × 18 =
21. 21.12 × 55 =
22. 22.30 × 15 =
23. 23.45 × 10 =
24. 24.10 × 125 =
25. 25.30 × 35 =
26. 26.55 × 38 =
27. 27.65 × 18 =
28. 28.55 × 20 =
29. 29.16 × 55 =
30. 30.125 × 32 =
31. 31.65 × 38 =
32. 32.65 × 20 =
33. 33.22 × 65 =
34. 34.45 × 12 =
35. 35.6 × 35 =
36. 36.15 × 20 =
37. 37.125 × 36 =
38. 38.32 × 55 =
39. 39.55 × 14 =
40. 40.28 × 125 =

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