Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 308 · 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. 1.18 × 8 =
2. 2.73 × 8 =
3. 3.58 × 8 =
4. 4.159 × 4 =
5. 5.72 × 8 =
6. 6.154 × 4 =
7. 7.47 × 8 =
8. 8.30 × 4 =
9. 9.106 × 4 =
10. 10.23 × 8 =
11. 11.72 × 4 =
12. 12.38 × 8 =
13. 13.14 × 4 =
14. 14.108 × 4 =
15. 15.138 × 4 =
16. 16.49 × 4 =
17. 17.53 × 8 =
18. 18.48 × 8 =
19. 19.43 × 4 =
20. 20.56 × 4 =
21. 21.63 × 4 =
22. 22.133 × 4 =
23. 23.125 × 4 =
24. 24.38 × 4 =
25. 25.58 × 8 =
26. 26.67 × 8 =
27. 27.145 × 4 =
28. 28.137 × 4 =
29. 29.135 × 4 =
30. 30.87 × 4 =
31. 31.39 × 8 =
32. 32.53 × 8 =
33. 33.58 × 4 =
34. 34.55 × 8 =
35. 35.131 × 4 =
36. 36.74 × 8 =
37. 37.16 × 8 =
38. 38.60 × 4 =
39. 39.43 × 4 =
40. 40.154 × 4 =

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