Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 489 · 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. 1.36 × 55 =
2. 2.35 × 26 =
3. 3.36 × 15 =
4. 4.75 × 6 =
5. 5.6 × 15 =
6. 6.25 × 28 =
7. 7.35 × 26 =
8. 8.26 × 65 =
9. 9.20 × 15 =
10. 10.34 × 45 =
11. 11.35 × 10 =
12. 12.30 × 125 =
13. 13.55 × 38 =
14. 14.32 × 75 =
15. 15.6 × 125 =
16. 16.38 × 75 =
17. 17.38 × 15 =
18. 18.30 × 45 =
19. 19.24 × 45 =
20. 20.55 × 24 =
21. 21.10 × 125 =
22. 22.40 × 15 =
23. 23.25 × 20 =
24. 24.75 × 40 =
25. 25.25 × 30 =
26. 26.12 × 75 =
27. 27.18 × 35 =
28. 28.40 × 15 =
29. 29.45 × 6 =
30. 30.14 × 15 =
31. 31.25 × 28 =
32. 32.14 × 25 =
33. 33.15 × 12 =
34. 34.65 × 30 =
35. 35.18 × 65 =
36. 36.125 × 36 =
37. 37.25 × 16 =
38. 38.15 × 26 =
39. 39.15 × 26 =
40. 40.10 × 35 =

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