Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 606 · 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. 1.20 × 25 =
2. 2.18 × 15 =
3. 3.75 × 38 =
4. 4.75 × 18 =
5. 5.30 × 75 =
6. 6.55 × 12 =
7. 7.35 × 18 =
8. 8.25 × 12 =
9. 9.45 × 14 =
10. 10.34 × 75 =
11. 11.8 × 25 =
12. 12.65 × 36 =
13. 13.38 × 25 =
14. 14.125 × 32 =
15. 15.12 × 125 =
16. 16.36 × 45 =
17. 17.75 × 12 =
18. 18.65 × 30 =
19. 19.32 × 15 =
20. 20.45 × 30 =
21. 21.35 × 28 =
22. 22.14 × 25 =
23. 23.15 × 40 =
24. 24.10 × 125 =
25. 25.40 × 25 =
26. 26.6 × 55 =
27. 27.40 × 15 =
28. 28.16 × 125 =
29. 29.25 × 40 =
30. 30.6 × 75 =
31. 31.35 × 34 =
32. 32.10 × 55 =
33. 33.75 × 34 =
34. 34.55 × 32 =
35. 35.75 × 16 =
36. 36.35 × 28 =
37. 37.8 × 25 =
38. 38.30 × 15 =
39. 39.6 × 35 =
40. 40.15 × 16 =

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