Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 170 · 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. 1.36 × 45 =
2. 2.16 × 75 =
3. 3.15 × 12 =
4. 4.25 × 18 =
5. 5.45 × 20 =
6. 6.65 × 24 =
7. 7.28 × 45 =
8. 8.75 × 10 =
9. 9.35 × 10 =
10. 10.16 × 45 =
11. 11.25 × 38 =
12. 12.55 × 30 =
13. 13.36 × 125 =
14. 14.25 × 14 =
15. 15.34 × 65 =
16. 16.8 × 25 =
17. 17.125 × 28 =
18. 18.34 × 15 =
19. 19.6 × 15 =
20. 20.10 × 75 =
21. 21.125 × 36 =
22. 22.25 × 40 =
23. 23.22 × 55 =
24. 24.36 × 65 =
25. 25.40 × 15 =
26. 26.40 × 15 =
27. 27.25 × 18 =
28. 28.32 × 55 =
29. 29.45 × 26 =
30. 30.125 × 28 =
31. 31.75 × 20 =
32. 32.65 × 6 =
33. 33.20 × 15 =
34. 34.22 × 45 =
35. 35.125 × 12 =
36. 36.36 × 35 =
37. 37.15 × 26 =
38. 38.34 × 25 =
39. 39.36 × 125 =
40. 40.34 × 65 =

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