Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 322 · 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. 1.139 × 4 =
2. 2.67 × 8 =
3. 3.75 × 8 =
4. 4.92 × 4 =
5. 5.110 × 4 =
6. 6.36 × 8 =
7. 7.50 × 4 =
8. 8.68 × 8 =
9. 9.38 × 8 =
10. 10.36 × 8 =
11. 11.71 × 8 =
12. 12.15 × 8 =
13. 13.153 × 4 =
14. 14.75 × 4 =
15. 15.110 × 4 =
16. 16.62 × 8 =
17. 17.25 × 8 =
18. 18.160 × 4 =
19. 19.151 × 4 =
20. 20.36 × 4 =
21. 21.51 × 4 =
22. 22.71 × 8 =
23. 23.58 × 4 =
24. 24.52 × 4 =
25. 25.31 × 4 =
26. 26.54 × 8 =
27. 27.26 × 8 =
28. 28.89 × 4 =
29. 29.43 × 4 =
30. 30.154 × 4 =
31. 31.61 × 4 =
32. 32.34 × 4 =
33. 33.158 × 4 =
34. 34.65 × 8 =
35. 35.150 × 4 =
36. 36.48 × 8 =
37. 37.39 × 8 =
38. 38.98 × 4 =
39. 39.140 × 4 =
40. 40.14 × 8 =

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