Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 503 · 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 × 15 =
2. 2.15 × 34 =
3. 3.14 × 15 =
4. 4.65 × 18 =
5. 5.6 × 55 =
6. 6.6 × 25 =
7. 7.18 × 55 =
8. 8.18 × 15 =
9. 9.40 × 15 =
10. 10.65 × 22 =
11. 11.22 × 45 =
12. 12.10 × 35 =
13. 13.65 × 8 =
14. 14.65 × 18 =
15. 15.125 × 30 =
16. 16.65 × 18 =
17. 17.25 × 40 =
18. 18.20 × 25 =
19. 19.38 × 15 =
20. 20.18 × 55 =
21. 21.45 × 38 =
22. 22.32 × 45 =
23. 23.75 × 34 =
24. 24.28 × 45 =
25. 25.40 × 125 =
26. 26.45 × 12 =
27. 27.75 × 14 =
28. 28.36 × 15 =
29. 29.15 × 32 =
30. 30.15 × 22 =
31. 31.35 × 12 =
32. 32.18 × 35 =
33. 33.25 × 10 =
34. 34.35 × 30 =
35. 35.20 × 75 =
36. 36.36 × 75 =
37. 37.45 × 14 =
38. 38.25 × 36 =
39. 39.125 × 14 =
40. 40.35 × 22 =

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