Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 912 · 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. 1.35 × 16 =
2. 2.15 × 18 =
3. 3.38 × 75 =
4. 4.65 × 38 =
5. 5.14 × 25 =
6. 6.32 × 45 =
7. 7.32 × 15 =
8. 8.15 × 36 =
9. 9.125 × 12 =
10. 10.15 × 20 =
11. 11.22 × 35 =
12. 12.18 × 15 =
13. 13.8 × 25 =
14. 14.25 × 16 =
15. 15.36 × 65 =
16. 16.8 × 75 =
17. 17.14 × 65 =
18. 18.75 × 20 =
19. 19.75 × 28 =
20. 20.75 × 6 =
21. 21.45 × 8 =
22. 22.12 × 45 =
23. 23.8 × 65 =
24. 24.22 × 25 =
25. 25.22 × 125 =
26. 26.75 × 8 =
27. 27.6 × 45 =
28. 28.6 × 65 =
29. 29.34 × 45 =
30. 30.16 × 65 =
31. 31.20 × 35 =
32. 32.18 × 45 =
33. 33.35 × 10 =
34. 34.8 × 65 =
35. 35.22 × 35 =
36. 36.25 × 20 =
37. 37.10 × 75 =
38. 38.55 × 14 =
39. 39.45 × 34 =
40. 40.65 × 40 =

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