Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 379 · 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. 1.15 × 20 =
2. 2.8 × 75 =
3. 3.6 × 35 =
4. 4.45 × 40 =
5. 5.18 × 25 =
6. 6.22 × 125 =
7. 7.26 × 25 =
8. 8.22 × 25 =
9. 9.55 × 6 =
10. 10.20 × 25 =
11. 11.10 × 35 =
12. 12.36 × 75 =
13. 13.75 × 24 =
14. 14.55 × 32 =
15. 15.75 × 6 =
16. 16.65 × 8 =
17. 17.15 × 38 =
18. 18.20 × 125 =
19. 19.14 × 25 =
20. 20.55 × 16 =
21. 21.35 × 24 =
22. 22.32 × 45 =
23. 23.45 × 14 =
24. 24.25 × 14 =
25. 25.18 × 75 =
26. 26.75 × 24 =
27. 27.10 × 25 =
28. 28.65 × 10 =
29. 29.16 × 65 =
30. 30.38 × 25 =
31. 31.45 × 8 =
32. 32.38 × 65 =
33. 33.125 × 30 =
34. 34.35 × 10 =
35. 35.40 × 75 =
36. 36.35 × 10 =
37. 37.35 × 8 =
38. 38.24 × 125 =
39. 39.34 × 65 =
40. 40.28 × 55 =

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