Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 268 · 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. 1.38 × 15 =
2. 2.38 × 35 =
3. 3.20 × 35 =
4. 4.55 × 30 =
5. 5.14 × 125 =
6. 6.20 × 65 =
7. 7.25 × 22 =
8. 8.75 × 18 =
9. 9.25 × 20 =
10. 10.38 × 45 =
11. 11.40 × 65 =
12. 12.55 × 22 =
13. 13.40 × 25 =
14. 14.125 × 12 =
15. 15.24 × 15 =
16. 16.36 × 75 =
17. 17.15 × 36 =
18. 18.20 × 65 =
19. 19.32 × 75 =
20. 20.16 × 15 =
21. 21.10 × 75 =
22. 22.12 × 55 =
23. 23.55 × 26 =
24. 24.34 × 125 =
25. 25.36 × 55 =
26. 26.16 × 45 =
27. 27.40 × 125 =
28. 28.15 × 8 =
29. 29.22 × 125 =
30. 30.15 × 36 =
31. 31.32 × 15 =
32. 32.40 × 35 =
33. 33.34 × 45 =
34. 34.125 × 26 =
35. 35.20 × 25 =
36. 36.65 × 32 =
37. 37.14 × 125 =
38. 38.26 × 25 =
39. 39.28 × 75 =
40. 40.40 × 55 =

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