Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 845 · 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. 1.57 × 8 =
2. 2.140 × 4 =
3. 3.24 × 8 =
4. 4.25 × 4 =
5. 5.38 × 8 =
6. 6.75 × 8 =
7. 7.94 × 4 =
8. 8.73 × 8 =
9. 9.59 × 8 =
10. 10.30 × 8 =
11. 11.48 × 8 =
12. 12.148 × 4 =
13. 13.48 × 8 =
14. 14.151 × 4 =
15. 15.104 × 4 =
16. 16.99 × 4 =
17. 17.160 × 4 =
18. 18.156 × 4 =
19. 19.14 × 4 =
20. 20.38 × 4 =
21. 21.71 × 8 =
22. 22.23 × 8 =
23. 23.14 × 4 =
24. 24.81 × 4 =
25. 25.40 × 4 =
26. 26.63 × 4 =
27. 27.67 × 8 =
28. 28.160 × 4 =
29. 29.89 × 4 =
30. 30.151 × 4 =
31. 31.53 × 8 =
32. 32.131 × 4 =
33. 33.53 × 8 =
34. 34.73 × 8 =
35. 35.71 × 8 =
36. 36.93 × 4 =
37. 37.28 × 8 =
38. 38.18 × 8 =
39. 39.86 × 4 =
40. 40.95 × 4 =

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