Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 548 · 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. 1.15 × 38 =
2. 2.15 × 36 =
3. 3.15 × 14 =
4. 4.65 × 36 =
5. 5.25 × 36 =
6. 6.16 × 15 =
7. 7.38 × 55 =
8. 8.40 × 15 =
9. 9.32 × 65 =
10. 10.38 × 125 =
11. 11.15 × 6 =
12. 12.25 × 16 =
13. 13.18 × 15 =
14. 14.35 × 30 =
15. 15.15 × 36 =
16. 16.65 × 10 =
17. 17.12 × 25 =
18. 18.45 × 32 =
19. 19.40 × 65 =
20. 20.28 × 55 =
21. 21.55 × 36 =
22. 22.10 × 15 =
23. 23.35 × 20 =
24. 24.25 × 34 =
25. 25.75 × 28 =
26. 26.22 × 35 =
27. 27.18 × 35 =
28. 28.10 × 45 =
29. 29.24 × 15 =
30. 30.10 × 55 =
31. 31.26 × 75 =
32. 32.75 × 24 =
33. 33.125 × 32 =
34. 34.45 × 18 =
35. 35.15 × 30 =
36. 36.10 × 65 =
37. 37.30 × 55 =
38. 38.125 × 14 =
39. 39.15 × 8 =
40. 40.38 × 55 =

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