Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 103 · 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. 1.29 × 8 =
2. 2.72 × 8 =
3. 3.152 × 4 =
4. 4.95 × 4 =
5. 5.13 × 4 =
6. 6.14 × 4 =
7. 7.41 × 8 =
8. 8.25 × 8 =
9. 9.14 × 4 =
10. 10.37 × 8 =
11. 11.72 × 8 =
12. 12.60 × 8 =
13. 13.39 × 8 =
14. 14.43 × 4 =
15. 15.22 × 8 =
16. 16.32 × 8 =
17. 17.153 × 4 =
18. 18.143 × 4 =
19. 19.78 × 4 =
20. 20.141 × 4 =
21. 21.18 × 8 =
22. 22.97 × 4 =
23. 23.59 × 8 =
24. 24.22 × 8 =
25. 25.144 × 4 =
26. 26.71 × 8 =
27. 27.92 × 4 =
28. 28.153 × 4 =
29. 29.147 × 4 =
30. 30.94 × 4 =
31. 31.69 × 8 =
32. 32.110 × 4 =
33. 33.158 × 4 =
34. 34.72 × 8 =
35. 35.120 × 4 =
36. 36.40 × 8 =
37. 37.54 × 4 =
38. 38.158 × 4 =
39. 39.43 × 8 =
40. 40.95 × 4 =

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