Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 889 · 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 × 45 =
2. 2.25 × 32 =
3. 3.35 × 32 =
4. 4.125 × 26 =
5. 5.8 × 75 =
6. 6.32 × 15 =
7. 7.45 × 14 =
8. 8.75 × 16 =
9. 9.55 × 24 =
10. 10.14 × 25 =
11. 11.6 × 25 =
12. 12.65 × 20 =
13. 13.35 × 8 =
14. 14.12 × 75 =
15. 15.35 × 24 =
16. 16.28 × 75 =
17. 17.28 × 35 =
18. 18.32 × 45 =
19. 19.25 × 12 =
20. 20.6 × 35 =
21. 21.75 × 8 =
22. 22.22 × 55 =
23. 23.55 × 34 =
24. 24.8 × 15 =
25. 25.15 × 32 =
26. 26.25 × 12 =
27. 27.125 × 16 =
28. 28.45 × 12 =
29. 29.65 × 28 =
30. 30.22 × 35 =
31. 31.125 × 24 =
32. 32.25 × 30 =
33. 33.18 × 15 =
34. 34.15 × 14 =
35. 35.36 × 35 =
36. 36.75 × 34 =
37. 37.75 × 40 =
38. 38.75 × 34 =
39. 39.75 × 16 =
40. 40.14 × 65 =

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