Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 123 · 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 × 30 =
2. 2.10 × 75 =
3. 3.125 × 18 =
4. 4.35 × 34 =
5. 5.25 × 24 =
6. 6.15 × 8 =
7. 7.12 × 25 =
8. 8.12 × 125 =
9. 9.15 × 28 =
10. 10.14 × 25 =
11. 11.35 × 18 =
12. 12.75 × 14 =
13. 13.32 × 45 =
14. 14.45 × 38 =
15. 15.65 × 12 =
16. 16.8 × 125 =
17. 17.10 × 35 =
18. 18.10 × 45 =
19. 19.125 × 18 =
20. 20.25 × 20 =
21. 21.14 × 55 =
22. 22.8 × 55 =
23. 23.18 × 125 =
24. 24.12 × 15 =
25. 25.6 × 55 =
26. 26.65 × 12 =
27. 27.8 × 65 =
28. 28.25 × 14 =
29. 29.65 × 40 =
30. 30.15 × 40 =
31. 31.14 × 75 =
32. 32.20 × 75 =
33. 33.45 × 20 =
34. 34.32 × 65 =
35. 35.8 × 45 =
36. 36.15 × 32 =
37. 37.20 × 45 =
38. 38.36 × 75 =
39. 39.20 × 25 =
40. 40.55 × 30 =

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