Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 164 · 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. 1.141 × 4 =
2. 2.54 × 8 =
3. 3.135 × 4 =
4. 4.18 × 8 =
5. 5.35 × 8 =
6. 6.74 × 8 =
7. 7.14 × 4 =
8. 8.126 × 4 =
9. 9.108 × 4 =
10. 10.132 × 4 =
11. 11.15 × 8 =
12. 12.35 × 8 =
13. 13.44 × 4 =
14. 14.43 × 4 =
15. 15.90 × 4 =
16. 16.34 × 8 =
17. 17.60 × 4 =
18. 18.49 × 8 =
19. 19.15 × 8 =
20. 20.21 × 8 =
21. 21.53 × 8 =
22. 22.19 × 8 =
23. 23.56 × 4 =
24. 24.70 × 8 =
25. 25.72 × 8 =
26. 26.50 × 8 =
27. 27.37 × 8 =
28. 28.46 × 8 =
29. 29.47 × 4 =
30. 30.70 × 8 =
31. 31.122 × 4 =
32. 32.23 × 8 =
33. 33.69 × 8 =
34. 34.30 × 4 =
35. 35.97 × 4 =
36. 36.72 × 8 =
37. 37.43 × 8 =
38. 38.25 × 8 =
39. 39.110 × 4 =
40. 40.64 × 8 =

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