Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 576 · 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. 1.54 × 8 =
2. 2.86 × 4 =
3. 3.23 × 8 =
4. 4.68 × 8 =
5. 5.40 × 8 =
6. 6.42 × 4 =
7. 7.62 × 4 =
8. 8.40 × 4 =
9. 9.141 × 4 =
10. 10.61 × 8 =
11. 11.56 × 4 =
12. 12.14 × 8 =
13. 13.86 × 4 =
14. 14.115 × 4 =
15. 15.47 × 8 =
16. 16.33 × 4 =
17. 17.143 × 4 =
18. 18.61 × 4 =
19. 19.121 × 4 =
20. 20.23 × 4 =
21. 21.48 × 8 =
22. 22.144 × 4 =
23. 23.53 × 8 =
24. 24.30 × 4 =
25. 25.25 × 4 =
26. 26.44 × 4 =
27. 27.117 × 4 =
28. 28.34 × 8 =
29. 29.91 × 4 =
30. 30.13 × 8 =
31. 31.58 × 8 =
32. 32.42 × 4 =
33. 33.73 × 4 =
34. 34.85 × 4 =
35. 35.24 × 8 =
36. 36.70 × 8 =
37. 37.55 × 4 =
38. 38.36 × 4 =
39. 39.37 × 8 =
40. 40.154 × 4 =

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