Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 121 · 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. 1.38 × 75 =
2. 2.18 × 35 =
3. 3.32 × 55 =
4. 4.25 × 22 =
5. 5.45 × 34 =
6. 6.10 × 15 =
7. 7.34 × 125 =
8. 8.25 × 34 =
9. 9.125 × 12 =
10. 10.35 × 32 =
11. 11.20 × 15 =
12. 12.45 × 16 =
13. 13.12 × 125 =
14. 14.35 × 14 =
15. 15.20 × 55 =
16. 16.125 × 12 =
17. 17.15 × 32 =
18. 18.15 × 34 =
19. 19.30 × 35 =
20. 20.28 × 15 =
21. 21.8 × 65 =
22. 22.35 × 30 =
23. 23.40 × 15 =
24. 24.125 × 32 =
25. 25.30 × 25 =
26. 26.55 × 6 =
27. 27.15 × 16 =
28. 28.65 × 14 =
29. 29.14 × 15 =
30. 30.14 × 35 =
31. 31.30 × 75 =
32. 32.55 × 6 =
33. 33.35 × 40 =
34. 34.25 × 16 =
35. 35.8 × 55 =
36. 36.34 × 65 =
37. 37.40 × 25 =
38. 38.12 × 125 =
39. 39.125 × 16 =
40. 40.14 × 25 =

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