Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 827 · 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. 1.14 × 55 =
2. 2.75 × 14 =
3. 3.26 × 65 =
4. 4.30 × 45 =
5. 5.65 × 26 =
6. 6.40 × 75 =
7. 7.26 × 45 =
8. 8.8 × 25 =
9. 9.35 × 40 =
10. 10.125 × 40 =
11. 11.125 × 10 =
12. 12.25 × 34 =
13. 13.16 × 15 =
14. 14.75 × 28 =
15. 15.45 × 38 =
16. 16.25 × 22 =
17. 17.15 × 30 =
18. 18.6 × 55 =
19. 19.30 × 75 =
20. 20.125 × 10 =
21. 21.8 × 25 =
22. 22.36 × 45 =
23. 23.45 × 34 =
24. 24.15 × 36 =
25. 25.75 × 34 =
26. 26.12 × 125 =
27. 27.8 × 25 =
28. 28.22 × 35 =
29. 29.65 × 16 =
30. 30.45 × 38 =
31. 31.28 × 75 =
32. 32.55 × 12 =
33. 33.32 × 25 =
34. 34.65 × 34 =
35. 35.12 × 75 =
36. 36.15 × 22 =
37. 37.26 × 65 =
38. 38.35 × 12 =
39. 39.28 × 15 =
40. 40.30 × 65 =

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