Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 851 · 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. 1.8 × 15 =
2. 2.125 × 22 =
3. 3.35 × 10 =
4. 4.75 × 6 =
5. 5.15 × 6 =
6. 6.30 × 65 =
7. 7.8 × 15 =
8. 8.45 × 38 =
9. 9.75 × 40 =
10. 10.20 × 55 =
11. 11.10 × 25 =
12. 12.26 × 25 =
13. 13.12 × 15 =
14. 14.14 × 65 =
15. 15.125 × 18 =
16. 16.15 × 24 =
17. 17.125 × 12 =
18. 18.15 × 28 =
19. 19.10 × 25 =
20. 20.45 × 38 =
21. 21.14 × 25 =
22. 22.65 × 26 =
23. 23.40 × 55 =
24. 24.12 × 125 =
25. 25.15 × 28 =
26. 26.32 × 65 =
27. 27.125 × 6 =
28. 28.25 × 8 =
29. 29.35 × 10 =
30. 30.55 × 20 =
31. 31.15 × 36 =
32. 32.40 × 35 =
33. 33.30 × 45 =
34. 34.22 × 45 =
35. 35.40 × 125 =
36. 36.25 × 14 =
37. 37.14 × 125 =
38. 38.36 × 35 =
39. 39.16 × 25 =
40. 40.34 × 15 =

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