Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 539 · 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 × 30 =
2. 2.55 × 6 =
3. 3.14 × 25 =
4. 4.22 × 65 =
5. 5.14 × 45 =
6. 6.15 × 6 =
7. 7.75 × 28 =
8. 8.35 × 26 =
9. 9.25 × 36 =
10. 10.18 × 125 =
11. 11.25 × 16 =
12. 12.38 × 125 =
13. 13.65 × 20 =
14. 14.8 × 15 =
15. 15.12 × 65 =
16. 16.14 × 35 =
17. 17.40 × 125 =
18. 18.25 × 16 =
19. 19.65 × 14 =
20. 20.30 × 25 =
21. 21.25 × 38 =
22. 22.32 × 125 =
23. 23.35 × 20 =
24. 24.40 × 55 =
25. 25.75 × 30 =
26. 26.38 × 65 =
27. 27.20 × 55 =
28. 28.55 × 12 =
29. 29.15 × 14 =
30. 30.25 × 16 =
31. 31.32 × 25 =
32. 32.28 × 75 =
33. 33.10 × 55 =
34. 34.45 × 18 =
35. 35.14 × 55 =
36. 36.125 × 32 =
37. 37.55 × 22 =
38. 38.8 × 15 =
39. 39.35 × 16 =
40. 40.26 × 125 =

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