Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 366 · 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. 1.22 × 125 =
2. 2.16 × 55 =
3. 3.10 × 15 =
4. 4.15 × 38 =
5. 5.18 × 55 =
6. 6.12 × 125 =
7. 7.28 × 15 =
8. 8.45 × 30 =
9. 9.45 × 22 =
10. 10.25 × 22 =
11. 11.10 × 55 =
12. 12.125 × 16 =
13. 13.75 × 30 =
14. 14.15 × 22 =
15. 15.15 × 34 =
16. 16.35 × 12 =
17. 17.15 × 32 =
18. 18.45 × 22 =
19. 19.45 × 34 =
20. 20.8 × 75 =
21. 21.16 × 35 =
22. 22.35 × 36 =
23. 23.38 × 15 =
24. 24.15 × 36 =
25. 25.125 × 8 =
26. 26.15 × 6 =
27. 27.14 × 15 =
28. 28.45 × 18 =
29. 29.16 × 75 =
30. 30.125 × 36 =
31. 31.15 × 30 =
32. 32.15 × 6 =
33. 33.25 × 40 =
34. 34.65 × 24 =
35. 35.40 × 35 =
36. 36.25 × 20 =
37. 37.125 × 30 =
38. 38.34 × 35 =
39. 39.15 × 12 =
40. 40.12 × 45 =

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