Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 813 · 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. 2.14 × 125 =
3. 3.24 × 45 =
4. 4.24 × 35 =
5. 5.8 × 35 =
6. 6.25 × 22 =
7. 7.38 × 25 =
8. 8.10 × 125 =
9. 9.40 × 55 =
10. 10.25 × 18 =
11. 11.12 × 125 =
12. 12.35 × 14 =
13. 13.22 × 125 =
14. 14.36 × 15 =
15. 15.15 × 28 =
16. 16.125 × 20 =
17. 17.16 × 65 =
18. 18.35 × 14 =
19. 19.12 × 35 =
20. 20.32 × 45 =
21. 21.15 × 22 =
22. 22.35 × 10 =
23. 23.125 × 38 =
24. 24.65 × 26 =
25. 25.15 × 14 =
26. 26.15 × 20 =
27. 27.45 × 14 =
28. 28.15 × 8 =
29. 29.34 × 35 =
30. 30.45 × 16 =
31. 31.35 × 8 =
32. 32.6 × 45 =
33. 33.15 × 38 =
34. 34.45 × 38 =
35. 35.55 × 20 =
36. 36.8 × 65 =
37. 37.25 × 14 =
38. 38.25 × 20 =
39. 39.35 × 10 =
40. 40.14 × 45 =

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