Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 780 · 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. 1.63 × 8 =
2. 2.15 × 8 =
3. 3.29 × 8 =
4. 4.99 × 4 =
5. 5.88 × 4 =
6. 6.48 × 8 =
7. 7.43 × 4 =
8. 8.136 × 4 =
9. 9.69 × 8 =
10. 10.114 × 4 =
11. 11.48 × 8 =
12. 12.33 × 4 =
13. 13.66 × 8 =
14. 14.47 × 4 =
15. 15.69 × 4 =
16. 16.111 × 4 =
17. 17.48 × 8 =
18. 18.50 × 8 =
19. 19.86 × 4 =
20. 20.28 × 8 =
21. 21.147 × 4 =
22. 22.14 × 8 =
23. 23.68 × 8 =
24. 24.47 × 8 =
25. 25.42 × 4 =
26. 26.26 × 8 =
27. 27.22 × 8 =
28. 28.156 × 4 =
29. 29.84 × 4 =
30. 30.92 × 4 =
31. 31.121 × 4 =
32. 32.14 × 8 =
33. 33.43 × 8 =
34. 34.40 × 8 =
35. 35.49 × 4 =
36. 36.129 × 4 =
37. 37.55 × 8 =
38. 38.58 × 8 =
39. 39.56 × 4 =
40. 40.154 × 4 =

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