Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 419 · 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. 1.20 × 15 =
2. 2.15 × 16 =
3. 3.45 × 24 =
4. 4.25 × 40 =
5. 5.75 × 14 =
6. 6.75 × 14 =
7. 7.65 × 40 =
8. 8.20 × 75 =
9. 9.26 × 75 =
10. 10.125 × 10 =
11. 11.12 × 125 =
12. 12.16 × 55 =
13. 13.15 × 18 =
14. 14.75 × 10 =
15. 15.25 × 36 =
16. 16.35 × 20 =
17. 17.15 × 16 =
18. 18.36 × 65 =
19. 19.35 × 40 =
20. 20.15 × 16 =
21. 21.15 × 8 =
22. 22.15 × 34 =
23. 23.30 × 55 =
24. 24.45 × 14 =
25. 25.30 × 55 =
26. 26.55 × 24 =
27. 27.15 × 8 =
28. 28.35 × 26 =
29. 29.38 × 75 =
30. 30.28 × 25 =
31. 31.26 × 55 =
32. 32.18 × 65 =
33. 33.12 × 15 =
34. 34.10 × 125 =
35. 35.125 × 18 =
36. 36.14 × 65 =
37. 37.25 × 36 =
38. 38.65 × 12 =
39. 39.75 × 34 =
40. 40.20 × 25 =

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