Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 860 · 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. 1.65 × 24 =
2. 2.15 × 40 =
3. 3.40 × 45 =
4. 4.35 × 40 =
5. 5.125 × 38 =
6. 6.8 × 55 =
7. 7.28 × 15 =
8. 8.25 × 40 =
9. 9.15 × 10 =
10. 10.25 × 16 =
11. 11.25 × 34 =
12. 12.55 × 28 =
13. 13.10 × 35 =
14. 14.40 × 55 =
15. 15.40 × 25 =
16. 16.38 × 55 =
17. 17.22 × 25 =
18. 18.25 × 38 =
19. 19.24 × 25 =
20. 20.20 × 15 =
21. 21.18 × 35 =
22. 22.14 × 25 =
23. 23.25 × 8 =
24. 24.65 × 6 =
25. 25.55 × 32 =
26. 26.16 × 35 =
27. 27.22 × 75 =
28. 28.65 × 10 =
29. 29.32 × 45 =
30. 30.10 × 15 =
31. 31.15 × 30 =
32. 32.10 × 65 =
33. 33.18 × 75 =
34. 34.18 × 55 =
35. 35.55 × 40 =
36. 36.15 × 28 =
37. 37.22 × 125 =
38. 38.35 × 12 =
39. 39.34 × 45 =
40. 40.55 × 36 =

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