Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 262 · 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. 1.15 × 10 =
2. 2.35 × 20 =
3. 3.36 × 25 =
4. 4.30 × 75 =
5. 5.75 × 34 =
6. 6.25 × 24 =
7. 7.75 × 10 =
8. 8.55 × 14 =
9. 9.6 × 55 =
10. 10.25 × 16 =
11. 11.34 × 15 =
12. 12.55 × 28 =
13. 13.10 × 65 =
14. 14.6 × 15 =
15. 15.26 × 25 =
16. 16.26 × 65 =
17. 17.12 × 75 =
18. 18.34 × 35 =
19. 19.20 × 25 =
20. 20.15 × 34 =
21. 21.14 × 15 =
22. 22.24 × 55 =
23. 23.45 × 36 =
24. 24.15 × 38 =
25. 25.10 × 65 =
26. 26.25 × 8 =
27. 27.38 × 65 =
28. 28.26 × 55 =
29. 29.26 × 25 =
30. 30.24 × 65 =
31. 31.8 × 45 =
32. 32.18 × 45 =
33. 33.65 × 12 =
34. 34.125 × 8 =
35. 35.30 × 55 =
36. 36.25 × 6 =
37. 37.36 × 15 =
38. 38.35 × 6 =
39. 39.45 × 14 =
40. 40.45 × 8 =

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