Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 39 · 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. 1.53 × 4 =
2. 2.86 × 4 =
3. 3.31 × 4 =
4. 4.156 × 4 =
5. 5.102 × 4 =
6. 6.20 × 8 =
7. 7.80 × 4 =
8. 8.20 × 8 =
9. 9.83 × 4 =
10. 10.73 × 4 =
11. 11.50 × 8 =
12. 12.74 × 8 =
13. 13.96 × 4 =
14. 14.12 × 8 =
15. 15.12 × 8 =
16. 16.28 × 8 =
17. 17.36 × 8 =
18. 18.42 × 8 =
19. 19.38 × 8 =
20. 20.22 × 4 =
21. 21.38 × 4 =
22. 22.37 × 8 =
23. 23.80 × 4 =
24. 24.59 × 4 =
25. 25.65 × 4 =
26. 26.56 × 4 =
27. 27.59 × 8 =
28. 28.14 × 8 =
29. 29.64 × 8 =
30. 30.82 × 4 =
31. 31.61 × 8 =
32. 32.49 × 4 =
33. 33.27 × 4 =
34. 34.72 × 8 =
35. 35.35 × 8 =
36. 36.14 × 8 =
37. 37.153 × 4 =
38. 38.68 × 4 =
39. 39.22 × 8 =
40. 40.69 × 8 =

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