Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 552 · 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. 1.6 × 15 =
2. 2.14 × 35 =
3. 3.18 × 55 =
4. 4.24 × 35 =
5. 5.20 × 125 =
6. 6.65 × 18 =
7. 7.55 × 18 =
8. 8.15 × 28 =
9. 9.15 × 6 =
10. 10.55 × 20 =
11. 11.25 × 12 =
12. 12.45 × 18 =
13. 13.20 × 45 =
14. 14.40 × 125 =
15. 15.28 × 125 =
16. 16.125 × 14 =
17. 17.34 × 35 =
18. 18.65 × 20 =
19. 19.25 × 6 =
20. 20.34 × 65 =
21. 21.125 × 14 =
22. 22.125 × 38 =
23. 23.10 × 45 =
24. 24.12 × 35 =
25. 25.30 × 15 =
26. 26.8 × 15 =
27. 27.15 × 32 =
28. 28.10 × 75 =
29. 29.6 × 35 =
30. 30.15 × 16 =
31. 31.8 × 55 =
32. 32.55 × 22 =
33. 33.26 × 75 =
34. 34.45 × 30 =
35. 35.75 × 20 =
36. 36.25 × 18 =
37. 37.125 × 28 =
38. 38.35 × 10 =
39. 39.45 × 28 =
40. 40.22 × 45 =

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