Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 165 · 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. 1.22 × 25 =
2. 2.15 × 14 =
3. 3.65 × 32 =
4. 4.16 × 25 =
5. 5.35 × 18 =
6. 6.16 × 65 =
7. 7.65 × 34 =
8. 8.24 × 55 =
9. 9.8 × 75 =
10. 10.125 × 12 =
11. 11.75 × 10 =
12. 12.25 × 40 =
13. 13.125 × 6 =
14. 14.24 × 75 =
15. 15.40 × 15 =
16. 16.75 × 34 =
17. 17.35 × 8 =
18. 18.55 × 40 =
19. 19.35 × 26 =
20. 20.10 × 125 =
21. 21.15 × 24 =
22. 22.35 × 22 =
23. 23.55 × 8 =
24. 24.65 × 10 =
25. 25.6 × 25 =
26. 26.65 × 12 =
27. 27.40 × 35 =
28. 28.30 × 125 =
29. 29.15 × 30 =
30. 30.15 × 36 =
31. 31.45 × 32 =
32. 32.30 × 55 =
33. 33.34 × 25 =
34. 34.38 × 125 =
35. 35.75 × 8 =
36. 36.28 × 65 =
37. 37.25 × 18 =
38. 38.22 × 15 =
39. 39.75 × 40 =
40. 40.32 × 55 =

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