Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 624 · 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. 1.30 × 8 =
2. 2.104 × 4 =
3. 3.79 × 4 =
4. 4.55 × 8 =
5. 5.39 × 8 =
6. 6.21 × 4 =
7. 7.75 × 8 =
8. 8.68 × 8 =
9. 9.21 × 4 =
10. 10.73 × 8 =
11. 11.53 × 8 =
12. 12.115 × 4 =
13. 13.18 × 8 =
14. 14.13 × 8 =
15. 15.83 × 4 =
16. 16.71 × 4 =
17. 17.110 × 4 =
18. 18.72 × 8 =
19. 19.75 × 4 =
20. 20.35 × 8 =
21. 21.49 × 4 =
22. 22.73 × 8 =
23. 23.67 × 8 =
24. 24.157 × 4 =
25. 25.76 × 4 =
26. 26.119 × 4 =
27. 27.62 × 8 =
28. 28.32 × 8 =
29. 29.46 × 8 =
30. 30.24 × 8 =
31. 31.68 × 8 =
32. 32.21 × 8 =
33. 33.64 × 8 =
34. 34.108 × 4 =
35. 35.65 × 8 =
36. 36.57 × 8 =
37. 37.63 × 8 =
38. 38.158 × 4 =
39. 39.14 × 4 =
40. 40.39 × 4 =

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