Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 16 · 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. 1.24 × 55 =
2. 2.20 × 65 =
3. 3.125 × 14 =
4. 4.6 × 15 =
5. 5.25 × 8 =
6. 6.12 × 45 =
7. 7.8 × 75 =
8. 8.55 × 20 =
9. 9.55 × 32 =
10. 10.125 × 22 =
11. 11.65 × 16 =
12. 12.40 × 55 =
13. 13.75 × 12 =
14. 14.14 × 125 =
15. 15.25 × 24 =
16. 16.26 × 55 =
17. 17.25 × 30 =
18. 18.24 × 125 =
19. 19.45 × 40 =
20. 20.15 × 26 =
21. 21.12 × 15 =
22. 22.125 × 20 =
23. 23.25 × 34 =
24. 24.75 × 18 =
25. 25.45 × 16 =
26. 26.25 × 14 =
27. 27.25 × 14 =
28. 28.32 × 15 =
29. 29.25 × 34 =
30. 30.25 × 6 =
31. 31.15 × 18 =
32. 32.25 × 28 =
33. 33.10 × 75 =
34. 34.22 × 55 =
35. 35.28 × 65 =
36. 36.45 × 10 =
37. 37.22 × 55 =
38. 38.40 × 15 =
39. 39.25 × 20 =
40. 40.16 × 25 =

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