Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 589 · 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. 1.6 × 45 =
2. 2.30 × 65 =
3. 3.30 × 15 =
4. 4.35 × 32 =
5. 5.55 × 26 =
6. 6.45 × 28 =
7. 7.26 × 75 =
8. 8.36 × 15 =
9. 9.45 × 8 =
10. 10.55 × 14 =
11. 11.75 × 38 =
12. 12.65 × 18 =
13. 13.25 × 20 =
14. 14.24 × 35 =
15. 15.22 × 55 =
16. 16.45 × 8 =
17. 17.45 × 32 =
18. 18.35 × 30 =
19. 19.8 × 45 =
20. 20.75 × 32 =
21. 21.15 × 16 =
22. 22.32 × 65 =
23. 23.15 × 24 =
24. 24.16 × 125 =
25. 25.34 × 125 =
26. 26.75 × 36 =
27. 27.6 × 25 =
28. 28.75 × 22 =
29. 29.24 × 15 =
30. 30.25 × 40 =
31. 31.55 × 18 =
32. 32.125 × 22 =
33. 33.26 × 25 =
34. 34.125 × 20 =
35. 35.20 × 15 =
36. 36.55 × 34 =
37. 37.18 × 55 =
38. 38.34 × 125 =
39. 39.25 × 16 =
40. 40.15 × 6 =

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