Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 77 · 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. 1.30 × 25 =
2. 2.15 × 30 =
3. 3.14 × 55 =
4. 4.20 × 75 =
5. 5.32 × 45 =
6. 6.14 × 65 =
7. 7.30 × 55 =
8. 8.16 × 55 =
9. 9.15 × 10 =
10. 10.40 × 55 =
11. 11.6 × 25 =
12. 12.32 × 15 =
13. 13.15 × 36 =
14. 14.75 × 36 =
15. 15.55 × 14 =
16. 16.65 × 40 =
17. 17.28 × 55 =
18. 18.15 × 36 =
19. 19.10 × 65 =
20. 20.32 × 75 =
21. 21.6 × 45 =
22. 22.14 × 55 =
23. 23.15 × 28 =
24. 24.15 × 16 =
25. 25.8 × 25 =
26. 26.22 × 25 =
27. 27.125 × 28 =
28. 28.15 × 20 =
29. 29.12 × 65 =
30. 30.125 × 38 =
31. 31.15 × 10 =
32. 32.36 × 25 =
33. 33.24 × 125 =
34. 34.16 × 65 =
35. 35.35 × 20 =
36. 36.20 × 65 =
37. 37.26 × 35 =
38. 38.75 × 6 =
39. 39.35 × 18 =
40. 40.22 × 15 =

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