Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 251 · 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. 1.28 × 15 =
2. 2.55 × 34 =
3. 3.8 × 65 =
4. 4.18 × 15 =
5. 5.65 × 14 =
6. 6.10 × 75 =
7. 7.25 × 14 =
8. 8.22 × 25 =
9. 9.35 × 34 =
10. 10.38 × 75 =
11. 11.55 × 36 =
12. 12.25 × 12 =
13. 13.6 × 35 =
14. 14.35 × 36 =
15. 15.15 × 26 =
16. 16.125 × 30 =
17. 17.24 × 65 =
18. 18.8 × 25 =
19. 19.8 × 35 =
20. 20.24 × 25 =
21. 21.18 × 65 =
22. 22.8 × 25 =
23. 23.6 × 125 =
24. 24.12 × 35 =
25. 25.30 × 75 =
26. 26.12 × 75 =
27. 27.65 × 6 =
28. 28.8 × 15 =
29. 29.55 × 38 =
30. 30.65 × 12 =
31. 31.25 × 34 =
32. 32.18 × 65 =
33. 33.10 × 125 =
34. 34.26 × 75 =
35. 35.10 × 75 =
36. 36.75 × 18 =
37. 37.15 × 24 =
38. 38.25 × 24 =
39. 39.34 × 75 =
40. 40.40 × 55 =

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