Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 431 · 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. 2.55 × 20 =
3. 3.45 × 14 =
4. 4.65 × 16 =
5. 5.55 × 24 =
6. 6.45 × 10 =
7. 7.8 × 45 =
8. 8.22 × 15 =
9. 9.15 × 10 =
10. 10.14 × 55 =
11. 11.35 × 20 =
12. 12.30 × 25 =
13. 13.6 × 65 =
14. 14.25 × 22 =
15. 15.22 × 65 =
16. 16.15 × 30 =
17. 17.26 × 15 =
18. 18.15 × 8 =
19. 19.65 × 20 =
20. 20.45 × 6 =
21. 21.36 × 15 =
22. 22.28 × 65 =
23. 23.15 × 16 =
24. 24.75 × 38 =
25. 25.75 × 28 =
26. 26.65 × 34 =
27. 27.6 × 125 =
28. 28.15 × 18 =
29. 29.30 × 65 =
30. 30.26 × 45 =
31. 31.55 × 6 =
32. 32.45 × 40 =
33. 33.35 × 34 =
34. 34.15 × 38 =
35. 35.10 × 15 =
36. 36.22 × 45 =
37. 37.18 × 25 =
38. 38.25 × 24 =
39. 39.22 × 35 =
40. 40.14 × 15 =

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