Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 406 · 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. 1.67 × 8 =
2. 2.48 × 8 =
3. 3.49 × 8 =
4. 4.69 × 4 =
5. 5.133 × 4 =
6. 6.65 × 8 =
7. 7.46 × 4 =
8. 8.50 × 8 =
9. 9.71 × 4 =
10. 10.14 × 8 =
11. 11.14 × 8 =
12. 12.74 × 8 =
13. 13.65 × 8 =
14. 14.44 × 8 =
15. 15.49 × 8 =
16. 16.67 × 8 =
17. 17.157 × 4 =
18. 18.69 × 8 =
19. 19.67 × 4 =
20. 20.17 × 4 =
21. 21.32 × 8 =
22. 22.30 × 8 =
23. 23.29 × 8 =
24. 24.134 × 4 =
25. 25.41 × 8 =
26. 26.53 × 4 =
27. 27.21 × 4 =
28. 28.38 × 8 =
29. 29.35 × 4 =
30. 30.29 × 8 =
31. 31.159 × 4 =
32. 32.13 × 8 =
33. 33.80 × 4 =
34. 34.91 × 4 =
35. 35.92 × 4 =
36. 36.124 × 4 =
37. 37.36 × 8 =
38. 38.40 × 8 =
39. 39.50 × 4 =
40. 40.117 × 4 =

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