Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 643 · 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 × 34 =
2. 2.45 × 8 =
3. 3.38 × 25 =
4. 4.20 × 25 =
5. 5.30 × 55 =
6. 6.38 × 35 =
7. 7.65 × 40 =
8. 8.55 × 14 =
9. 9.65 × 14 =
10. 10.6 × 65 =
11. 11.40 × 25 =
12. 12.6 × 15 =
13. 13.55 × 14 =
14. 14.14 × 65 =
15. 15.15 × 40 =
16. 16.14 × 55 =
17. 17.20 × 125 =
18. 18.55 × 18 =
19. 19.20 × 55 =
20. 20.16 × 25 =
21. 21.30 × 65 =
22. 22.125 × 34 =
23. 23.14 × 15 =
24. 24.25 × 18 =
25. 25.15 × 38 =
26. 26.8 × 45 =
27. 27.75 × 18 =
28. 28.24 × 65 =
29. 29.22 × 45 =
30. 30.35 × 38 =
31. 31.34 × 45 =
32. 32.12 × 15 =
33. 33.28 × 125 =
34. 34.25 × 32 =
35. 35.45 × 36 =
36. 36.25 × 8 =
37. 37.25 × 36 =
38. 38.16 × 75 =
39. 39.15 × 28 =
40. 40.55 × 40 =

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