Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 382 · 40 questions

The fast method (Double up): × 4: double, then double again. × 8: double three times. To double a big number, double the tens and the ones separately and add: double 37 = 60 + 14 = 74.

1. 1.15 × 4 =
2. 2.155 × 4 =
3. 3.25 × 4 =
4. 4.50 × 8 =
5. 5.24 × 4 =
6. 6.73 × 8 =
7. 7.126 × 4 =
8. 8.64 × 4 =
9. 9.116 × 4 =
10. 10.33 × 8 =
11. 11.73 × 8 =
12. 12.42 × 8 =
13. 13.65 × 8 =
14. 14.22 × 8 =
15. 15.152 × 4 =
16. 16.40 × 8 =
17. 17.72 × 8 =
18. 18.108 × 4 =
19. 19.59 × 8 =
20. 20.35 × 8 =
21. 21.55 × 8 =
22. 22.32 × 8 =
23. 23.49 × 8 =
24. 24.19 × 8 =
25. 25.54 × 4 =
26. 26.67 × 8 =
27. 27.71 × 8 =
28. 28.115 × 4 =
29. 29.57 × 8 =
30. 30.119 × 4 =
31. 31.77 × 4 =
32. 32.38 × 8 =
33. 33.20 × 8 =
34. 34.55 × 8 =
35. 35.71 × 4 =
36. 36.74 × 4 =
37. 37.129 × 4 =
38. 38.49 × 4 =
39. 39.62 × 8 =
40. 40.20 × 4 =

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