Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 979 · 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. 1.10 × 35 =
2. 2.20 × 55 =
3. 3.125 × 38 =
4. 4.30 × 75 =
5. 5.75 × 8 =
6. 6.55 × 26 =
7. 7.12 × 65 =
8. 8.24 × 65 =
9. 9.55 × 12 =
10. 10.32 × 25 =
11. 11.15 × 34 =
12. 12.18 × 45 =
13. 13.38 × 25 =
14. 14.8 × 65 =
15. 15.75 × 22 =
16. 16.26 × 55 =
17. 17.20 × 15 =
18. 18.25 × 32 =
19. 19.18 × 35 =
20. 20.45 × 40 =
21. 21.34 × 65 =
22. 22.25 × 6 =
23. 23.12 × 45 =
24. 24.10 × 125 =
25. 25.125 × 14 =
26. 26.36 × 125 =
27. 27.18 × 125 =
28. 28.125 × 18 =
29. 29.18 × 25 =
30. 30.24 × 25 =
31. 31.55 × 10 =
32. 32.75 × 26 =
33. 33.25 × 10 =
34. 34.22 × 75 =
35. 35.25 × 34 =
36. 36.25 × 8 =
37. 37.55 × 40 =
38. 38.65 × 28 =
39. 39.65 × 12 =
40. 40.55 × 36 =

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