Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 402 · 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. 1.108 × 4 =
2. 2.49 × 8 =
3. 3.59 × 4 =
4. 4.36 × 4 =
5. 5.126 × 4 =
6. 6.137 × 4 =
7. 7.18 × 4 =
8. 8.33 × 4 =
9. 9.27 × 8 =
10. 10.14 × 8 =
11. 11.51 × 8 =
12. 12.19 × 4 =
13. 13.106 × 4 =
14. 14.153 × 4 =
15. 15.104 × 4 =
16. 16.157 × 4 =
17. 17.73 × 8 =
18. 18.72 × 4 =
19. 19.20 × 8 =
20. 20.14 × 8 =
21. 21.40 × 4 =
22. 22.157 × 4 =
23. 23.15 × 8 =
24. 24.53 × 4 =
25. 25.53 × 8 =
26. 26.29 × 8 =
27. 27.53 × 8 =
28. 28.62 × 8 =
29. 29.144 × 4 =
30. 30.37 × 4 =
31. 31.155 × 4 =
32. 32.36 × 8 =
33. 33.36 × 8 =
34. 34.29 × 8 =
35. 35.25 × 8 =
36. 36.41 × 8 =
37. 37.36 × 8 =
38. 38.25 × 4 =
39. 39.53 × 4 =
40. 40.118 × 4 =

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