Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 326 · 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. 1.43 × 8 =
2. 2.147 × 4 =
3. 3.30 × 4 =
4. 4.21 × 8 =
5. 5.40 × 8 =
6. 6.64 × 8 =
7. 7.121 × 4 =
8. 8.49 × 8 =
9. 9.50 × 4 =
10. 10.58 × 8 =
11. 11.141 × 4 =
12. 12.60 × 8 =
13. 13.56 × 4 =
14. 14.71 × 8 =
15. 15.64 × 8 =
16. 16.67 × 8 =
17. 17.31 × 4 =
18. 18.26 × 4 =
19. 19.53 × 8 =
20. 20.107 × 4 =
21. 21.42 × 8 =
22. 22.58 × 8 =
23. 23.19 × 8 =
24. 24.78 × 4 =
25. 25.17 × 8 =
26. 26.40 × 8 =
27. 27.114 × 4 =
28. 28.96 × 4 =
29. 29.47 × 8 =
30. 30.87 × 4 =
31. 31.37 × 8 =
32. 32.70 × 4 =
33. 33.49 × 8 =
34. 34.27 × 4 =
35. 35.28 × 4 =
36. 36.45 × 8 =
37. 37.82 × 4 =
38. 38.65 × 4 =
39. 39.51 × 4 =
40. 40.52 × 4 =

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