Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 496 · 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. 1.40 × 65 =
2. 2.14 × 55 =
3. 3.75 × 12 =
4. 4.12 × 15 =
5. 5.65 × 40 =
6. 6.40 × 125 =
7. 7.125 × 16 =
8. 8.45 × 30 =
9. 9.75 × 34 =
10. 10.30 × 125 =
11. 11.35 × 6 =
12. 12.34 × 65 =
13. 13.35 × 34 =
14. 14.18 × 125 =
15. 15.6 × 125 =
16. 16.18 × 65 =
17. 17.6 × 35 =
18. 18.25 × 30 =
19. 19.16 × 35 =
20. 20.55 × 18 =
21. 21.34 × 25 =
22. 22.38 × 75 =
23. 23.55 × 34 =
24. 24.35 × 18 =
25. 25.75 × 40 =
26. 26.36 × 125 =
27. 27.8 × 15 =
28. 28.35 × 34 =
29. 29.75 × 40 =
30. 30.45 × 32 =
31. 31.55 × 40 =
32. 32.10 × 45 =
33. 33.125 × 32 =
34. 34.125 × 34 =
35. 35.36 × 15 =
36. 36.15 × 12 =
37. 37.125 × 8 =
38. 38.65 × 36 =
39. 39.45 × 26 =
40. 40.55 × 22 =

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