Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 37 · 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. 1.140 × 4 =
2. 2.42 × 4 =
3. 3.64 × 8 =
4. 4.72 × 4 =
5. 5.39 × 4 =
6. 6.110 × 4 =
7. 7.40 × 8 =
8. 8.131 × 4 =
9. 9.71 × 4 =
10. 10.155 × 4 =
11. 11.84 × 4 =
12. 12.25 × 8 =
13. 13.66 × 8 =
14. 14.38 × 8 =
15. 15.14 × 4 =
16. 16.44 × 4 =
17. 17.97 × 4 =
18. 18.41 × 8 =
19. 19.73 × 4 =
20. 20.56 × 4 =
21. 21.33 × 8 =
22. 22.146 × 4 =
23. 23.19 × 4 =
24. 24.72 × 8 =
25. 25.60 × 4 =
26. 26.26 × 8 =
27. 27.30 × 8 =
28. 28.44 × 4 =
29. 29.36 × 8 =
30. 30.82 × 4 =
31. 31.51 × 8 =
32. 32.26 × 8 =
33. 33.23 × 4 =
34. 34.40 × 8 =
35. 35.49 × 8 =
36. 36.52 × 8 =
37. 37.55 × 8 =
38. 38.44 × 8 =
39. 39.27 × 4 =
40. 40.100 × 4 =

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