Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 599 · 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. 1.45 × 4 =
2. 2.61 × 4 =
3. 3.149 × 4 =
4. 4.28 × 8 =
5. 5.17 × 8 =
6. 6.48 × 8 =
7. 7.24 × 8 =
8. 8.135 × 4 =
9. 9.17 × 8 =
10. 10.54 × 8 =
11. 11.54 × 8 =
12. 12.45 × 4 =
13. 13.145 × 4 =
14. 14.45 × 4 =
15. 15.23 × 4 =
16. 16.43 × 4 =
17. 17.20 × 8 =
18. 18.35 × 8 =
19. 19.62 × 8 =
20. 20.34 × 8 =
21. 21.143 × 4 =
22. 22.26 × 8 =
23. 23.41 × 8 =
24. 24.29 × 8 =
25. 25.97 × 4 =
26. 26.140 × 4 =
27. 27.19 × 8 =
28. 28.34 × 8 =
29. 29.98 × 4 =
30. 30.82 × 4 =
31. 31.21 × 4 =
32. 32.19 × 8 =
33. 33.148 × 4 =
34. 34.148 × 4 =
35. 35.54 × 8 =
36. 36.62 × 4 =
37. 37.78 × 4 =
38. 38.30 × 8 =
39. 39.39 × 8 =
40. 40.99 × 4 =

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