Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 408 · 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. 1.40 × 25 =
2. 2.25 × 24 =
3. 3.55 × 24 =
4. 4.22 × 15 =
5. 5.14 × 35 =
6. 6.36 × 35 =
7. 7.35 × 38 =
8. 8.12 × 55 =
9. 9.8 × 125 =
10. 10.34 × 25 =
11. 11.35 × 20 =
12. 12.65 × 20 =
13. 13.45 × 18 =
14. 14.55 × 14 =
15. 15.10 × 25 =
16. 16.75 × 18 =
17. 17.25 × 26 =
18. 18.18 × 15 =
19. 19.25 × 30 =
20. 20.125 × 12 =
21. 21.8 × 35 =
22. 22.15 × 22 =
23. 23.45 × 30 =
24. 24.35 × 18 =
25. 25.22 × 15 =
26. 26.30 × 45 =
27. 27.34 × 65 =
28. 28.25 × 16 =
29. 29.30 × 15 =
30. 30.22 × 125 =
31. 31.15 × 20 =
32. 32.10 × 55 =
33. 33.28 × 25 =
34. 34.45 × 16 =
35. 35.35 × 10 =
36. 36.25 × 12 =
37. 37.10 × 125 =
38. 38.16 × 25 =
39. 39.45 × 12 =
40. 40.20 × 65 =

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