Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 617 · 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. 1.8 × 75 =
2. 2.26 × 25 =
3. 3.125 × 30 =
4. 4.38 × 65 =
5. 5.36 × 45 =
6. 6.15 × 8 =
7. 7.35 × 8 =
8. 8.12 × 65 =
9. 9.35 × 6 =
10. 10.6 × 45 =
11. 11.6 × 125 =
12. 12.14 × 25 =
13. 13.12 × 45 =
14. 14.25 × 40 =
15. 15.75 × 8 =
16. 16.75 × 10 =
17. 17.12 × 15 =
18. 18.55 × 14 =
19. 19.40 × 65 =
20. 20.55 × 10 =
21. 21.35 × 26 =
22. 22.14 × 125 =
23. 23.16 × 125 =
24. 24.12 × 45 =
25. 25.16 × 45 =
26. 26.35 × 38 =
27. 27.65 × 22 =
28. 28.75 × 38 =
29. 29.32 × 55 =
30. 30.65 × 20 =
31. 31.65 × 36 =
32. 32.40 × 35 =
33. 33.45 × 14 =
34. 34.15 × 28 =
35. 35.22 × 15 =
36. 36.38 × 75 =
37. 37.32 × 125 =
38. 38.36 × 35 =
39. 39.16 × 65 =
40. 40.65 × 24 =

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