Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 660 · 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. 1.14 × 55 =
2. 2.15 × 22 =
3. 3.75 × 10 =
4. 4.8 × 25 =
5. 5.8 × 35 =
6. 6.75 × 28 =
7. 7.35 × 10 =
8. 8.18 × 15 =
9. 9.40 × 65 =
10. 10.15 × 16 =
11. 11.20 × 35 =
12. 12.10 × 35 =
13. 13.35 × 16 =
14. 14.12 × 65 =
15. 15.45 × 10 =
16. 16.12 × 125 =
17. 17.26 × 125 =
18. 18.45 × 8 =
19. 19.55 × 12 =
20. 20.55 × 12 =
21. 21.75 × 8 =
22. 22.12 × 75 =
23. 23.38 × 65 =
24. 24.15 × 36 =
25. 25.6 × 25 =
26. 26.10 × 55 =
27. 27.15 × 36 =
28. 28.24 × 125 =
29. 29.6 × 55 =
30. 30.6 × 65 =
31. 31.15 × 16 =
32. 32.14 × 25 =
33. 33.24 × 65 =
34. 34.75 × 12 =
35. 35.15 × 12 =
36. 36.10 × 35 =
37. 37.18 × 45 =
38. 38.65 × 38 =
39. 39.38 × 25 =
40. 40.125 × 12 =

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