Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 939 · 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. 2.45 × 16 =
3. 3.125 × 40 =
4. 4.20 × 15 =
5. 5.16 × 25 =
6. 6.45 × 16 =
7. 7.65 × 14 =
8. 8.8 × 45 =
9. 9.20 × 65 =
10. 10.30 × 55 =
11. 11.125 × 16 =
12. 12.10 × 25 =
13. 13.15 × 12 =
14. 14.32 × 35 =
15. 15.25 × 30 =
16. 16.75 × 20 =
17. 17.8 × 65 =
18. 18.15 × 38 =
19. 19.55 × 24 =
20. 20.125 × 28 =
21. 21.12 × 65 =
22. 22.25 × 18 =
23. 23.15 × 6 =
24. 24.6 × 15 =
25. 25.22 × 65 =
26. 26.38 × 125 =
27. 27.36 × 35 =
28. 28.34 × 75 =
29. 29.22 × 45 =
30. 30.6 × 75 =
31. 31.6 × 65 =
32. 32.45 × 22 =
33. 33.14 × 35 =
34. 34.25 × 14 =
35. 35.38 × 45 =
36. 36.16 × 65 =
37. 37.125 × 18 =
38. 38.75 × 20 =
39. 39.35 × 18 =
40. 40.25 × 16 =

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