Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 823 · 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. 1.24 × 55 =
2. 2.25 × 24 =
3. 3.55 × 32 =
4. 4.125 × 34 =
5. 5.28 × 35 =
6. 6.40 × 45 =
7. 7.55 × 16 =
8. 8.10 × 75 =
9. 9.30 × 15 =
10. 10.15 × 10 =
11. 11.45 × 26 =
12. 12.40 × 15 =
13. 13.18 × 75 =
14. 14.36 × 35 =
15. 15.35 × 28 =
16. 16.24 × 65 =
17. 17.25 × 10 =
18. 18.10 × 75 =
19. 19.15 × 20 =
20. 20.15 × 6 =
21. 21.32 × 75 =
22. 22.55 × 14 =
23. 23.38 × 35 =
24. 24.16 × 45 =
25. 25.6 × 15 =
26. 26.34 × 55 =
27. 27.65 × 16 =
28. 28.25 × 10 =
29. 29.75 × 36 =
30. 30.35 × 34 =
31. 31.38 × 25 =
32. 32.16 × 75 =
33. 33.10 × 55 =
34. 34.16 × 65 =
35. 35.65 × 28 =
36. 36.15 × 10 =
37. 37.125 × 16 =
38. 38.36 × 15 =
39. 39.125 × 20 =
40. 40.15 × 12 =

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