Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 811 · 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. 2.45 × 14 =
3. 3.25 × 20 =
4. 4.36 × 25 =
5. 5.18 × 35 =
6. 6.45 × 14 =
7. 7.15 × 22 =
8. 8.40 × 125 =
9. 9.25 × 14 =
10. 10.24 × 55 =
11. 11.15 × 12 =
12. 12.38 × 25 =
13. 13.38 × 55 =
14. 14.32 × 25 =
15. 15.75 × 38 =
16. 16.22 × 125 =
17. 17.34 × 15 =
18. 18.26 × 55 =
19. 19.24 × 15 =
20. 20.25 × 38 =
21. 21.24 × 75 =
22. 22.55 × 26 =
23. 23.12 × 75 =
24. 24.65 × 32 =
25. 25.28 × 65 =
26. 26.15 × 38 =
27. 27.15 × 16 =
28. 28.45 × 14 =
29. 29.24 × 45 =
30. 30.12 × 55 =
31. 31.75 × 34 =
32. 32.14 × 75 =
33. 33.34 × 125 =
34. 34.22 × 25 =
35. 35.125 × 8 =
36. 36.35 × 16 =
37. 37.10 × 15 =
38. 38.40 × 15 =
39. 39.25 × 38 =
40. 40.65 × 26 =

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