Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 942 · 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 × 30 =
2. 2.6 × 65 =
3. 3.28 × 15 =
4. 4.25 × 30 =
5. 5.65 × 32 =
6. 6.18 × 25 =
7. 7.125 × 24 =
8. 8.55 × 40 =
9. 9.55 × 6 =
10. 10.14 × 15 =
11. 11.75 × 8 =
12. 12.125 × 36 =
13. 13.65 × 8 =
14. 14.125 × 6 =
15. 15.75 × 16 =
16. 16.25 × 22 =
17. 17.25 × 24 =
18. 18.30 × 15 =
19. 19.75 × 38 =
20. 20.15 × 10 =
21. 21.35 × 26 =
22. 22.40 × 65 =
23. 23.14 × 35 =
24. 24.14 × 75 =
25. 25.32 × 25 =
26. 26.55 × 10 =
27. 27.32 × 45 =
28. 28.25 × 10 =
29. 29.38 × 55 =
30. 30.35 × 14 =
31. 31.24 × 75 =
32. 32.20 × 125 =
33. 33.28 × 15 =
34. 34.8 × 125 =
35. 35.55 × 32 =
36. 36.55 × 22 =
37. 37.65 × 20 =
38. 38.24 × 15 =
39. 39.10 × 75 =
40. 40.20 × 45 =

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