Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 416 · 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. 1.8 × 25 =
2. 2.14 × 25 =
3. 3.25 × 6 =
4. 4.35 × 34 =
5. 5.34 × 25 =
6. 6.25 × 14 =
7. 7.15 × 10 =
8. 8.75 × 34 =
9. 9.35 × 36 =
10. 10.35 × 10 =
11. 11.36 × 55 =
12. 12.15 × 12 =
13. 13.10 × 35 =
14. 14.40 × 65 =
15. 15.35 × 16 =
16. 16.20 × 55 =
17. 17.14 × 45 =
18. 18.15 × 30 =
19. 19.65 × 38 =
20. 20.32 × 75 =
21. 21.65 × 36 =
22. 22.26 × 75 =
23. 23.8 × 75 =
24. 24.24 × 15 =
25. 25.28 × 75 =
26. 26.25 × 28 =
27. 27.25 × 6 =
28. 28.18 × 65 =
29. 29.15 × 28 =
30. 30.25 × 8 =
31. 31.45 × 18 =
32. 32.15 × 38 =
33. 33.125 × 22 =
34. 34.15 × 8 =
35. 35.28 × 15 =
36. 36.34 × 75 =
37. 37.55 × 10 =
38. 38.125 × 16 =
39. 39.28 × 45 =
40. 40.26 × 35 =

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