Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 908 · 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 × 75 =
2. 2.15 × 24 =
3. 3.30 × 25 =
4. 4.24 × 125 =
5. 5.75 × 32 =
6. 6.55 × 20 =
7. 7.25 × 28 =
8. 8.25 × 14 =
9. 9.35 × 6 =
10. 10.12 × 65 =
11. 11.14 × 65 =
12. 12.38 × 25 =
13. 13.34 × 55 =
14. 14.22 × 75 =
15. 15.55 × 6 =
16. 16.25 × 12 =
17. 17.15 × 14 =
18. 18.55 × 8 =
19. 19.125 × 24 =
20. 20.38 × 15 =
21. 21.45 × 40 =
22. 22.55 × 20 =
23. 23.12 × 125 =
24. 24.45 × 36 =
25. 25.20 × 25 =
26. 26.18 × 15 =
27. 27.15 × 20 =
28. 28.24 × 65 =
29. 29.65 × 24 =
30. 30.15 × 16 =
31. 31.8 × 35 =
32. 32.30 × 125 =
33. 33.18 × 125 =
34. 34.32 × 45 =
35. 35.40 × 25 =
36. 36.125 × 32 =
37. 37.65 × 38 =
38. 38.45 × 16 =
39. 39.35 × 34 =
40. 40.12 × 55 =

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