Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 270 · 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. 1.28 × 15 =
2. 2.6 × 25 =
3. 3.125 × 12 =
4. 4.25 × 32 =
5. 5.15 × 18 =
6. 6.125 × 26 =
7. 7.125 × 20 =
8. 8.15 × 32 =
9. 9.65 × 20 =
10. 10.28 × 15 =
11. 11.45 × 16 =
12. 12.75 × 12 =
13. 13.32 × 35 =
14. 14.26 × 25 =
15. 15.65 × 34 =
16. 16.26 × 125 =
17. 17.15 × 20 =
18. 18.75 × 18 =
19. 19.15 × 40 =
20. 20.35 × 6 =
21. 21.35 × 40 =
22. 22.8 × 45 =
23. 23.15 × 18 =
24. 24.6 × 35 =
25. 25.6 × 125 =
26. 26.65 × 40 =
27. 27.38 × 15 =
28. 28.15 × 14 =
29. 29.35 × 6 =
30. 30.12 × 15 =
31. 31.38 × 25 =
32. 32.45 × 30 =
33. 33.15 × 28 =
34. 34.65 × 34 =
35. 35.8 × 15 =
36. 36.36 × 65 =
37. 37.45 × 6 =
38. 38.45 × 30 =
39. 39.75 × 12 =
40. 40.34 × 65 =

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