Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 64 · 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. 1.28 × 125 =
2. 2.15 × 12 =
3. 3.34 × 75 =
4. 4.55 × 38 =
5. 5.45 × 16 =
6. 6.6 × 45 =
7. 7.6 × 125 =
8. 8.32 × 45 =
9. 9.40 × 45 =
10. 10.26 × 125 =
11. 11.65 × 16 =
12. 12.6 × 45 =
13. 13.55 × 38 =
14. 14.26 × 65 =
15. 15.35 × 36 =
16. 16.15 × 6 =
17. 17.26 × 15 =
18. 18.25 × 20 =
19. 19.15 × 18 =
20. 20.65 × 18 =
21. 21.125 × 6 =
22. 22.65 × 18 =
23. 23.35 × 24 =
24. 24.30 × 65 =
25. 25.38 × 35 =
26. 26.8 × 25 =
27. 27.65 × 16 =
28. 28.35 × 22 =
29. 29.32 × 75 =
30. 30.65 × 18 =
31. 31.55 × 14 =
32. 32.8 × 15 =
33. 33.32 × 65 =
34. 34.35 × 6 =
35. 35.15 × 32 =
36. 36.75 × 16 =
37. 37.30 × 45 =
38. 38.65 × 32 =
39. 39.20 × 45 =
40. 40.40 × 25 =

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