Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 493 · 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. 1.30 × 4 =
2. 2.38 × 4 =
3. 3.22 × 8 =
4. 4.24 × 4 =
5. 5.74 × 4 =
6. 6.54 × 8 =
7. 7.148 × 4 =
8. 8.47 × 8 =
9. 9.96 × 4 =
10. 10.23 × 8 =
11. 11.13 × 4 =
12. 12.17 × 4 =
13. 13.33 × 4 =
14. 14.71 × 8 =
15. 15.48 × 4 =
16. 16.73 × 8 =
17. 17.40 × 8 =
18. 18.117 × 4 =
19. 19.86 × 4 =
20. 20.79 × 4 =
21. 21.22 × 8 =
22. 22.157 × 4 =
23. 23.78 × 4 =
24. 24.18 × 8 =
25. 25.12 × 8 =
26. 26.140 × 4 =
27. 27.122 × 4 =
28. 28.21 × 8 =
29. 29.19 × 8 =
30. 30.132 × 4 =
31. 31.33 × 8 =
32. 32.59 × 8 =
33. 33.31 × 8 =
34. 34.43 × 8 =
35. 35.130 × 4 =
36. 36.22 × 8 =
37. 37.84 × 4 =
38. 38.41 × 4 =
39. 39.105 × 4 =
40. 40.32 × 4 =

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