Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 308 · 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 × 38 =
2. 2.14 × 15 =
3. 3.15 × 34 =
4. 4.75 × 38 =
5. 5.6 × 15 =
6. 6.45 × 34 =
7. 7.55 × 20 =
8. 8.16 × 25 =
9. 9.65 × 22 =
10. 10.65 × 14 =
11. 11.30 × 15 =
12. 12.38 × 25 =
13. 13.55 × 40 =
14. 14.36 × 55 =
15. 15.12 × 55 =
16. 16.18 × 15 =
17. 17.55 × 16 =
18. 18.24 × 35 =
19. 19.8 × 35 =
20. 20.65 × 38 =
21. 21.15 × 12 =
22. 22.32 × 75 =
23. 23.15 × 24 =
24. 24.25 × 8 =
25. 25.55 × 8 =
26. 26.65 × 34 =
27. 27.14 × 75 =
28. 28.125 × 12 =
29. 29.6 × 125 =
30. 30.15 × 30 =
31. 31.25 × 22 =
32. 32.15 × 10 =
33. 33.38 × 15 =
34. 34.15 × 20 =
35. 35.35 × 10 =
36. 36.35 × 16 =
37. 37.20 × 75 =
38. 38.125 × 20 =
39. 39.28 × 35 =
40. 40.20 × 35 =

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