Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 672 · 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. 1.40 × 8 =
2. 2.81 × 4 =
3. 3.40 × 8 =
4. 4.34 × 8 =
5. 5.12 × 8 =
6. 6.102 × 4 =
7. 7.140 × 4 =
8. 8.28 × 4 =
9. 9.155 × 4 =
10. 10.146 × 4 =
11. 11.51 × 4 =
12. 12.69 × 8 =
13. 13.30 × 8 =
14. 14.38 × 8 =
15. 15.46 × 4 =
16. 16.29 × 4 =
17. 17.60 × 8 =
18. 18.55 × 8 =
19. 19.20 × 4 =
20. 20.79 × 4 =
21. 21.153 × 4 =
22. 22.93 × 4 =
23. 23.86 × 4 =
24. 24.26 × 4 =
25. 25.16 × 8 =
26. 26.85 × 4 =
27. 27.21 × 8 =
28. 28.53 × 4 =
29. 29.124 × 4 =
30. 30.68 × 8 =
31. 31.95 × 4 =
32. 32.62 × 4 =
33. 33.147 × 4 =
34. 34.28 × 4 =
35. 35.62 × 4 =
36. 36.26 × 8 =
37. 37.124 × 4 =
38. 38.14 × 8 =
39. 39.56 × 8 =
40. 40.70 × 8 =

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