Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 456 · 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. 1.75 × 4 =
2. 2.143 × 4 =
3. 3.152 × 4 =
4. 4.31 × 4 =
5. 5.18 × 8 =
6. 6.49 × 4 =
7. 7.35 × 4 =
8. 8.91 × 4 =
9. 9.46 × 4 =
10. 10.106 × 4 =
11. 11.68 × 8 =
12. 12.21 × 8 =
13. 13.137 × 4 =
14. 14.42 × 8 =
15. 15.50 × 8 =
16. 16.71 × 4 =
17. 17.30 × 8 =
18. 18.44 × 8 =
19. 19.53 × 8 =
20. 20.13 × 8 =
21. 21.120 × 4 =
22. 22.127 × 4 =
23. 23.121 × 4 =
24. 24.91 × 4 =
25. 25.21 × 8 =
26. 26.108 × 4 =
27. 27.19 × 4 =
28. 28.57 × 8 =
29. 29.29 × 8 =
30. 30.45 × 8 =
31. 31.118 × 4 =
32. 32.159 × 4 =
33. 33.21 × 8 =
34. 34.143 × 4 =
35. 35.52 × 4 =
36. 36.40 × 4 =
37. 37.41 × 8 =
38. 38.39 × 8 =
39. 39.54 × 8 =
40. 40.28 × 8 =

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