Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 435 · 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. 1.68 × 8 =
2. 2.57 × 4 =
3. 3.18 × 8 =
4. 4.104 × 4 =
5. 5.101 × 4 =
6. 6.40 × 8 =
7. 7.33 × 8 =
8. 8.27 × 4 =
9. 9.148 × 4 =
10. 10.72 × 8 =
11. 11.27 × 8 =
12. 12.31 × 4 =
13. 13.33 × 8 =
14. 14.43 × 8 =
15. 15.65 × 8 =
16. 16.119 × 4 =
17. 17.51 × 4 =
18. 18.35 × 8 =
19. 19.40 × 4 =
20. 20.72 × 8 =
21. 21.75 × 8 =
22. 22.59 × 8 =
23. 23.24 × 8 =
24. 24.49 × 4 =
25. 25.49 × 4 =
26. 26.19 × 8 =
27. 27.39 × 8 =
28. 28.21 × 8 =
29. 29.18 × 4 =
30. 30.67 × 8 =
31. 31.155 × 4 =
32. 32.67 × 8 =
33. 33.45 × 8 =
34. 34.152 × 4 =
35. 35.73 × 8 =
36. 36.75 × 8 =
37. 37.71 × 8 =
38. 38.38 × 4 =
39. 39.33 × 4 =
40. 40.25 × 4 =

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