Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 164 · 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. 1.10 × 45 =
2. 2.45 × 20 =
3. 3.12 × 15 =
4. 4.10 × 65 =
5. 5.75 × 38 =
6. 6.8 × 15 =
7. 7.12 × 35 =
8. 8.25 × 24 =
9. 9.6 × 75 =
10. 10.38 × 45 =
11. 11.65 × 34 =
12. 12.8 × 25 =
13. 13.22 × 25 =
14. 14.55 × 26 =
15. 15.6 × 15 =
16. 16.75 × 36 =
17. 17.125 × 16 =
18. 18.18 × 55 =
19. 19.75 × 32 =
20. 20.10 × 65 =
21. 21.55 × 30 =
22. 22.25 × 16 =
23. 23.55 × 40 =
24. 24.55 × 34 =
25. 25.15 × 6 =
26. 26.14 × 65 =
27. 27.125 × 10 =
28. 28.8 × 15 =
29. 29.45 × 10 =
30. 30.75 × 10 =
31. 31.28 × 125 =
32. 32.45 × 10 =
33. 33.45 × 36 =
34. 34.45 × 6 =
35. 35.18 × 75 =
36. 36.18 × 35 =
37. 37.35 × 14 =
38. 38.36 × 55 =
39. 39.28 × 15 =
40. 40.35 × 26 =

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