Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 370 · 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. 1.14 × 45 =
2. 2.38 × 45 =
3. 3.25 × 8 =
4. 4.35 × 6 =
5. 5.8 × 65 =
6. 6.22 × 15 =
7. 7.65 × 24 =
8. 8.15 × 40 =
9. 9.36 × 55 =
10. 10.25 × 16 =
11. 11.38 × 15 =
12. 12.25 × 18 =
13. 13.25 × 10 =
14. 14.8 × 15 =
15. 15.40 × 25 =
16. 16.125 × 16 =
17. 17.65 × 16 =
18. 18.75 × 36 =
19. 19.75 × 10 =
20. 20.45 × 40 =
21. 21.15 × 14 =
22. 22.32 × 25 =
23. 23.16 × 25 =
24. 24.65 × 12 =
25. 25.16 × 15 =
26. 26.8 × 45 =
27. 27.32 × 15 =
28. 28.16 × 15 =
29. 29.65 × 34 =
30. 30.22 × 55 =
31. 31.75 × 24 =
32. 32.22 × 65 =
33. 33.35 × 30 =
34. 34.25 × 30 =
35. 35.25 × 10 =
36. 36.40 × 125 =
37. 37.75 × 30 =
38. 38.16 × 55 =
39. 39.26 × 55 =
40. 40.125 × 40 =

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