Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 938 · 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 × 24 =
2. 2.24 × 35 =
3. 3.32 × 25 =
4. 4.125 × 20 =
5. 5.15 × 20 =
6. 6.32 × 25 =
7. 7.25 × 16 =
8. 8.75 × 28 =
9. 9.30 × 45 =
10. 10.40 × 65 =
11. 11.45 × 34 =
12. 12.32 × 15 =
13. 13.55 × 32 =
14. 14.28 × 25 =
15. 15.8 × 25 =
16. 16.125 × 18 =
17. 17.8 × 35 =
18. 18.65 × 8 =
19. 19.35 × 12 =
20. 20.25 × 20 =
21. 21.20 × 45 =
22. 22.35 × 32 =
23. 23.25 × 30 =
24. 24.28 × 75 =
25. 25.8 × 125 =
26. 26.16 × 65 =
27. 27.12 × 75 =
28. 28.65 × 10 =
29. 29.32 × 15 =
30. 30.26 × 35 =
31. 31.25 × 38 =
32. 32.22 × 125 =
33. 33.12 × 65 =
34. 34.45 × 6 =
35. 35.75 × 14 =
36. 36.12 × 125 =
37. 37.15 × 38 =
38. 38.75 × 28 =
39. 39.125 × 40 =
40. 40.45 × 20 =

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