Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 879 · 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. 1.150 × 4 =
2. 2.59 × 4 =
3. 3.51 × 8 =
4. 4.151 × 4 =
5. 5.18 × 8 =
6. 6.17 × 4 =
7. 7.33 × 4 =
8. 8.42 × 8 =
9. 9.32 × 8 =
10. 10.55 × 4 =
11. 11.20 × 8 =
12. 12.48 × 8 =
13. 13.74 × 8 =
14. 14.85 × 4 =
15. 15.57 × 8 =
16. 16.65 × 4 =
17. 17.45 × 4 =
18. 18.43 × 8 =
19. 19.102 × 4 =
20. 20.21 × 8 =
21. 21.19 × 8 =
22. 22.25 × 4 =
23. 23.54 × 8 =
24. 24.95 × 4 =
25. 25.49 × 4 =
26. 26.124 × 4 =
27. 27.20 × 8 =
28. 28.155 × 4 =
29. 29.59 × 4 =
30. 30.21 × 8 =
31. 31.44 × 8 =
32. 32.27 × 4 =
33. 33.28 × 4 =
34. 34.59 × 8 =
35. 35.52 × 8 =
36. 36.21 × 8 =
37. 37.54 × 4 =
38. 38.47 × 8 =
39. 39.34 × 8 =
40. 40.27 × 4 =

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