Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 412 · 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. 1.32 × 8 =
2. 2.136 × 4 =
3. 3.118 × 4 =
4. 4.146 × 4 =
5. 5.71 × 8 =
6. 6.37 × 4 =
7. 7.52 × 4 =
8. 8.14 × 4 =
9. 9.43 × 8 =
10. 10.41 × 4 =
11. 11.18 × 4 =
12. 12.15 × 8 =
13. 13.15 × 4 =
14. 14.23 × 8 =
15. 15.73 × 4 =
16. 16.97 × 4 =
17. 17.60 × 8 =
18. 18.15 × 8 =
19. 19.41 × 8 =
20. 20.34 × 4 =
21. 21.60 × 8 =
22. 22.141 × 4 =
23. 23.17 × 4 =
24. 24.26 × 8 =
25. 25.50 × 8 =
26. 26.20 × 4 =
27. 27.115 × 4 =
28. 28.117 × 4 =
29. 29.16 × 8 =
30. 30.71 × 8 =
31. 31.13 × 8 =
32. 32.72 × 8 =
33. 33.44 × 4 =
34. 34.98 × 4 =
35. 35.143 × 4 =
36. 36.14 × 8 =
37. 37.92 × 4 =
38. 38.61 × 4 =
39. 39.160 × 4 =
40. 40.33 × 8 =

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