Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 770 · 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. 2.100 × 4 =
3. 3.150 × 4 =
4. 4.20 × 8 =
5. 5.22 × 4 =
6. 6.56 × 8 =
7. 7.70 × 4 =
8. 8.147 × 4 =
9. 9.104 × 4 =
10. 10.37 × 4 =
11. 11.47 × 8 =
12. 12.45 × 8 =
13. 13.19 × 8 =
14. 14.13 × 4 =
15. 15.74 × 8 =
16. 16.72 × 4 =
17. 17.16 × 8 =
18. 18.90 × 4 =
19. 19.116 × 4 =
20. 20.46 × 4 =
21. 21.154 × 4 =
22. 22.68 × 4 =
23. 23.131 × 4 =
24. 24.79 × 4 =
25. 25.93 × 4 =
26. 26.29 × 4 =
27. 27.33 × 4 =
28. 28.74 × 8 =
29. 29.72 × 8 =
30. 30.38 × 8 =
31. 31.34 × 8 =
32. 32.37 × 4 =
33. 33.67 × 4 =
34. 34.139 × 4 =
35. 35.31 × 4 =
36. 36.84 × 4 =
37. 37.48 × 8 =
38. 38.21 × 8 =
39. 39.31 × 4 =
40. 40.64 × 8 =

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