Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 657 · 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. 1.24 × 45 =
2. 2.12 × 15 =
3. 3.15 × 10 =
4. 4.15 × 32 =
5. 5.75 × 10 =
6. 6.30 × 65 =
7. 7.45 × 20 =
8. 8.45 × 10 =
9. 9.36 × 15 =
10. 10.32 × 65 =
11. 11.12 × 45 =
12. 12.38 × 25 =
13. 13.45 × 40 =
14. 14.14 × 45 =
15. 15.125 × 10 =
16. 16.75 × 18 =
17. 17.26 × 15 =
18. 18.25 × 24 =
19. 19.6 × 75 =
20. 20.34 × 125 =
21. 21.36 × 25 =
22. 22.125 × 28 =
23. 23.38 × 65 =
24. 24.35 × 30 =
25. 25.12 × 15 =
26. 26.55 × 14 =
27. 27.55 × 38 =
28. 28.55 × 16 =
29. 29.20 × 65 =
30. 30.8 × 15 =
31. 31.55 × 22 =
32. 32.36 × 15 =
33. 33.55 × 6 =
34. 34.20 × 35 =
35. 35.14 × 125 =
36. 36.25 × 28 =
37. 37.45 × 20 =
38. 38.25 × 10 =
39. 39.25 × 32 =
40. 40.35 × 40 =

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