Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 780 · 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. 1.18 × 25 =
2. 2.6 × 15 =
3. 3.38 × 25 =
4. 4.125 × 14 =
5. 5.125 × 14 =
6. 6.15 × 6 =
7. 7.24 × 65 =
8. 8.15 × 34 =
9. 9.45 × 12 =
10. 10.32 × 65 =
11. 11.45 × 14 =
12. 12.15 × 34 =
13. 13.12 × 75 =
14. 14.28 × 55 =
15. 15.25 × 38 =
16. 16.35 × 34 =
17. 17.55 × 28 =
18. 18.40 × 45 =
19. 19.6 × 65 =
20. 20.35 × 18 =
21. 21.25 × 20 =
22. 22.6 × 25 =
23. 23.65 × 6 =
24. 24.15 × 18 =
25. 25.26 × 125 =
26. 26.15 × 8 =
27. 27.75 × 34 =
28. 28.36 × 125 =
29. 29.30 × 75 =
30. 30.15 × 14 =
31. 31.25 × 18 =
32. 32.14 × 125 =
33. 33.55 × 14 =
34. 34.6 × 35 =
35. 35.10 × 45 =
36. 36.25 × 16 =
37. 37.15 × 8 =
38. 38.35 × 8 =
39. 39.28 × 55 =
40. 40.45 × 20 =

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