Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 15 · 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. 1.65 × 38 =
2. 2.45 × 38 =
3. 3.24 × 125 =
4. 4.55 × 6 =
5. 5.55 × 28 =
6. 6.14 × 65 =
7. 7.15 × 12 =
8. 8.45 × 10 =
9. 9.6 × 15 =
10. 10.15 × 28 =
11. 11.25 × 22 =
12. 12.38 × 55 =
13. 13.65 × 10 =
14. 14.125 × 36 =
15. 15.15 × 16 =
16. 16.75 × 8 =
17. 17.65 × 30 =
18. 18.38 × 125 =
19. 19.75 × 12 =
20. 20.22 × 125 =
21. 21.20 × 125 =
22. 22.8 × 35 =
23. 23.15 × 32 =
24. 24.25 × 8 =
25. 25.25 × 24 =
26. 26.25 × 10 =
27. 27.15 × 28 =
28. 28.25 × 20 =
29. 29.6 × 65 =
30. 30.8 × 125 =
31. 31.15 × 28 =
32. 32.26 × 15 =
33. 33.35 × 36 =
34. 34.65 × 20 =
35. 35.6 × 15 =
36. 36.65 × 34 =
37. 37.25 × 26 =
38. 38.75 × 10 =
39. 39.55 × 18 =
40. 40.24 × 35 =

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