Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 891 · 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. 1.22 × 15 =
2. 2.65 × 10 =
3. 3.55 × 16 =
4. 4.6 × 35 =
5. 5.40 × 125 =
6. 6.6 × 55 =
7. 7.14 × 45 =
8. 8.75 × 14 =
9. 9.15 × 12 =
10. 10.35 × 20 =
11. 11.35 × 14 =
12. 12.8 × 25 =
13. 13.20 × 45 =
14. 14.55 × 12 =
15. 15.65 × 8 =
16. 16.8 × 65 =
17. 17.15 × 28 =
18. 18.40 × 45 =
19. 19.20 × 65 =
20. 20.35 × 38 =
21. 21.35 × 18 =
22. 22.10 × 45 =
23. 23.25 × 6 =
24. 24.35 × 34 =
25. 25.38 × 55 =
26. 26.36 × 25 =
27. 27.30 × 65 =
28. 28.25 × 12 =
29. 29.24 × 25 =
30. 30.25 × 30 =
31. 31.20 × 45 =
32. 32.32 × 15 =
33. 33.36 × 125 =
34. 34.24 × 55 =
35. 35.16 × 25 =
36. 36.18 × 25 =
37. 37.125 × 6 =
38. 38.125 × 14 =
39. 39.75 × 16 =
40. 40.30 × 65 =

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