Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 475 · 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. 1.55 × 10 =
2. 2.20 × 55 =
3. 3.40 × 55 =
4. 4.75 × 20 =
5. 5.36 × 45 =
6. 6.15 × 28 =
7. 7.35 × 22 =
8. 8.32 × 25 =
9. 9.14 × 35 =
10. 10.26 × 65 =
11. 11.10 × 15 =
12. 12.65 × 36 =
13. 13.75 × 10 =
14. 14.35 × 12 =
15. 15.34 × 125 =
16. 16.38 × 55 =
17. 17.125 × 40 =
18. 18.10 × 15 =
19. 19.16 × 25 =
20. 20.45 × 20 =
21. 21.16 × 55 =
22. 22.38 × 125 =
23. 23.36 × 35 =
24. 24.35 × 16 =
25. 25.24 × 125 =
26. 26.38 × 25 =
27. 27.36 × 65 =
28. 28.75 × 8 =
29. 29.40 × 65 =
30. 30.75 × 14 =
31. 31.125 × 38 =
32. 32.22 × 55 =
33. 33.15 × 26 =
34. 34.24 × 125 =
35. 35.15 × 24 =
36. 36.65 × 40 =
37. 37.10 × 35 =
38. 38.32 × 65 =
39. 39.40 × 35 =
40. 40.125 × 28 =

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