Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 713 · 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 × 4 =
2. 2.45 × 8 =
3. 3.77 × 4 =
4. 4.75 × 8 =
5. 5.139 × 4 =
6. 6.34 × 4 =
7. 7.148 × 4 =
8. 8.18 × 4 =
9. 9.21 × 4 =
10. 10.19 × 8 =
11. 11.34 × 8 =
12. 12.75 × 4 =
13. 13.45 × 4 =
14. 14.125 × 4 =
15. 15.63 × 8 =
16. 16.29 × 8 =
17. 17.17 × 4 =
18. 18.45 × 4 =
19. 19.31 × 4 =
20. 20.45 × 8 =
21. 21.56 × 8 =
22. 22.50 × 4 =
23. 23.151 × 4 =
24. 24.113 × 4 =
25. 25.45 × 4 =
26. 26.17 × 4 =
27. 27.102 × 4 =
28. 28.21 × 8 =
29. 29.21 × 8 =
30. 30.132 × 4 =
31. 31.13 × 8 =
32. 32.51 × 4 =
33. 33.98 × 4 =
34. 34.119 × 4 =
35. 35.154 × 4 =
36. 36.39 × 4 =
37. 37.66 × 8 =
38. 38.59 × 4 =
39. 39.33 × 8 =
40. 40.58 × 8 =

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