Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 903 · 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. 2.47 × 4 =
3. 3.63 × 8 =
4. 4.36 × 8 =
5. 5.27 × 4 =
6. 6.125 × 4 =
7. 7.106 × 4 =
8. 8.46 × 8 =
9. 9.134 × 4 =
10. 10.66 × 4 =
11. 11.60 × 4 =
12. 12.49 × 8 =
13. 13.68 × 8 =
14. 14.124 × 4 =
15. 15.84 × 4 =
16. 16.52 × 8 =
17. 17.138 × 4 =
18. 18.60 × 8 =
19. 19.31 × 4 =
20. 20.35 × 8 =
21. 21.26 × 8 =
22. 22.20 × 8 =
23. 23.115 × 4 =
24. 24.102 × 4 =
25. 25.21 × 8 =
26. 26.26 × 8 =
27. 27.147 × 4 =
28. 28.44 × 8 =
29. 29.25 × 8 =
30. 30.49 × 4 =
31. 31.21 × 4 =
32. 32.131 × 4 =
33. 33.129 × 4 =
34. 34.146 × 4 =
35. 35.25 × 8 =
36. 36.52 × 4 =
37. 37.66 × 8 =
38. 38.33 × 8 =
39. 39.31 × 4 =
40. 40.72 × 4 =

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