Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 432 · 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. 1.66 × 4 =
2. 2.47 × 4 =
3. 3.40 × 4 =
4. 4.64 × 4 =
5. 5.160 × 4 =
6. 6.68 × 8 =
7. 7.24 × 4 =
8. 8.30 × 8 =
9. 9.39 × 4 =
10. 10.32 × 8 =
11. 11.144 × 4 =
12. 12.138 × 4 =
13. 13.57 × 8 =
14. 14.76 × 4 =
15. 15.80 × 4 =
16. 16.22 × 8 =
17. 17.110 × 4 =
18. 18.46 × 4 =
19. 19.12 × 8 =
20. 20.36 × 8 =
21. 21.66 × 4 =
22. 22.46 × 8 =
23. 23.105 × 4 =
24. 24.34 × 4 =
25. 25.70 × 8 =
26. 26.16 × 8 =
27. 27.12 × 8 =
28. 28.60 × 4 =
29. 29.85 × 4 =
30. 30.50 × 8 =
31. 31.105 × 4 =
32. 32.15 × 8 =
33. 33.39 × 8 =
34. 34.113 × 4 =
35. 35.34 × 8 =
36. 36.42 × 8 =
37. 37.39 × 8 =
38. 38.28 × 8 =
39. 39.16 × 8 =
40. 40.86 × 4 =

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