Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 359 · 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. 1.10 × 45 =
2. 2.45 × 30 =
3. 3.14 × 25 =
4. 4.34 × 65 =
5. 5.55 × 36 =
6. 6.55 × 18 =
7. 7.10 × 45 =
8. 8.15 × 24 =
9. 9.55 × 18 =
10. 10.75 × 26 =
11. 11.22 × 35 =
12. 12.16 × 75 =
13. 13.25 × 22 =
14. 14.8 × 65 =
15. 15.10 × 15 =
16. 16.45 × 40 =
17. 17.38 × 65 =
18. 18.35 × 38 =
19. 19.25 × 24 =
20. 20.15 × 20 =
21. 21.20 × 65 =
22. 22.75 × 36 =
23. 23.8 × 25 =
24. 24.125 × 12 =
25. 25.125 × 14 =
26. 26.20 × 65 =
27. 27.26 × 55 =
28. 28.32 × 15 =
29. 29.25 × 28 =
30. 30.15 × 6 =
31. 31.25 × 34 =
32. 32.55 × 32 =
33. 33.34 × 35 =
34. 34.35 × 6 =
35. 35.35 × 22 =
36. 36.10 × 125 =
37. 37.40 × 35 =
38. 38.55 × 30 =
39. 39.125 × 14 =
40. 40.36 × 25 =

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