Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 815 · 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 × 30 =
2. 2.8 × 15 =
3. 3.36 × 35 =
4. 4.14 × 65 =
5. 5.35 × 34 =
6. 6.38 × 45 =
7. 7.24 × 15 =
8. 8.8 × 55 =
9. 9.30 × 25 =
10. 10.38 × 125 =
11. 11.8 × 25 =
12. 12.8 × 125 =
13. 13.75 × 18 =
14. 14.28 × 55 =
15. 15.125 × 30 =
16. 16.75 × 18 =
17. 17.26 × 15 =
18. 18.45 × 40 =
19. 19.125 × 22 =
20. 20.38 × 55 =
21. 21.8 × 75 =
22. 22.45 × 34 =
23. 23.15 × 8 =
24. 24.30 × 35 =
25. 25.34 × 25 =
26. 26.34 × 125 =
27. 27.45 × 18 =
28. 28.125 × 24 =
29. 29.12 × 55 =
30. 30.32 × 15 =
31. 31.16 × 25 =
32. 32.35 × 24 =
33. 33.35 × 10 =
34. 34.36 × 15 =
35. 35.8 × 45 =
36. 36.15 × 20 =
37. 37.38 × 125 =
38. 38.125 × 30 =
39. 39.35 × 34 =
40. 40.25 × 18 =

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