Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 997 · 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 × 55 =
2. 2.65 × 14 =
3. 3.34 × 55 =
4. 4.35 × 6 =
5. 5.28 × 25 =
6. 6.22 × 55 =
7. 7.22 × 65 =
8. 8.55 × 14 =
9. 9.35 × 18 =
10. 10.14 × 45 =
11. 11.10 × 75 =
12. 12.65 × 22 =
13. 13.35 × 38 =
14. 14.38 × 55 =
15. 15.125 × 14 =
16. 16.28 × 125 =
17. 17.55 × 10 =
18. 18.45 × 20 =
19. 19.34 × 65 =
20. 20.40 × 25 =
21. 21.65 × 10 =
22. 22.75 × 18 =
23. 23.38 × 35 =
24. 24.8 × 55 =
25. 25.75 × 40 =
26. 26.15 × 12 =
27. 27.125 × 26 =
28. 28.55 × 28 =
29. 29.35 × 32 =
30. 30.35 × 16 =
31. 31.30 × 65 =
32. 32.45 × 24 =
33. 33.45 × 24 =
34. 34.55 × 38 =
35. 35.125 × 24 =
36. 36.15 × 26 =
37. 37.35 × 16 =
38. 38.55 × 20 =
39. 39.16 × 65 =
40. 40.35 × 38 =

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