Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 244 · 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. 1.155 × 4 =
2. 2.145 × 4 =
3. 3.42 × 4 =
4. 4.46 × 8 =
5. 5.36 × 8 =
6. 6.47 × 4 =
7. 7.65 × 8 =
8. 8.153 × 4 =
9. 9.14 × 8 =
10. 10.44 × 8 =
11. 11.91 × 4 =
12. 12.59 × 8 =
13. 13.75 × 8 =
14. 14.67 × 8 =
15. 15.80 × 4 =
16. 16.30 × 8 =
17. 17.46 × 8 =
18. 18.135 × 4 =
19. 19.55 × 4 =
20. 20.145 × 4 =
21. 21.53 × 8 =
22. 22.27 × 8 =
23. 23.63 × 8 =
24. 24.18 × 4 =
25. 25.124 × 4 =
26. 26.51 × 4 =
27. 27.27 × 8 =
28. 28.86 × 4 =
29. 29.38 × 4 =
30. 30.25 × 4 =
31. 31.54 × 8 =
32. 32.66 × 8 =
33. 33.153 × 4 =
34. 34.140 × 4 =
35. 35.152 × 4 =
36. 36.67 × 8 =
37. 37.60 × 8 =
38. 38.152 × 4 =
39. 39.63 × 4 =
40. 40.21 × 8 =

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