Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 618 · 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 × 36 =
2. 2.8 × 55 =
3. 3.8 × 65 =
4. 4.32 × 45 =
5. 5.35 × 32 =
6. 6.15 × 16 =
7. 7.45 × 34 =
8. 8.15 × 32 =
9. 9.12 × 15 =
10. 10.45 × 40 =
11. 11.16 × 15 =
12. 12.8 × 65 =
13. 13.35 × 34 =
14. 14.28 × 45 =
15. 15.34 × 25 =
16. 16.55 × 38 =
17. 17.6 × 65 =
18. 18.125 × 22 =
19. 19.28 × 15 =
20. 20.35 × 12 =
21. 21.125 × 22 =
22. 22.15 × 18 =
23. 23.25 × 26 =
24. 24.35 × 40 =
25. 25.125 × 22 =
26. 26.26 × 35 =
27. 27.75 × 32 =
28. 28.10 × 125 =
29. 29.12 × 15 =
30. 30.10 × 25 =
31. 31.14 × 75 =
32. 32.38 × 125 =
33. 33.25 × 18 =
34. 34.34 × 45 =
35. 35.25 × 32 =
36. 36.125 × 16 =
37. 37.75 × 34 =
38. 38.8 × 65 =
39. 39.35 × 26 =
40. 40.25 × 20 =

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