Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 146 · 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. 1.83 × 4 =
2. 2.75 × 8 =
3. 3.78 × 4 =
4. 4.33 × 8 =
5. 5.73 × 8 =
6. 6.13 × 8 =
7. 7.101 × 4 =
8. 8.28 × 8 =
9. 9.51 × 8 =
10. 10.13 × 8 =
11. 11.63 × 8 =
12. 12.68 × 4 =
13. 13.144 × 4 =
14. 14.120 × 4 =
15. 15.30 × 8 =
16. 16.49 × 8 =
17. 17.74 × 8 =
18. 18.69 × 4 =
19. 19.63 × 8 =
20. 20.31 × 4 =
21. 21.80 × 4 =
22. 22.31 × 4 =
23. 23.60 × 8 =
24. 24.67 × 8 =
25. 25.54 × 8 =
26. 26.95 × 4 =
27. 27.30 × 8 =
28. 28.61 × 8 =
29. 29.92 × 4 =
30. 30.14 × 4 =
31. 31.75 × 8 =
32. 32.16 × 8 =
33. 33.101 × 4 =
34. 34.106 × 4 =
35. 35.50 × 8 =
36. 36.135 × 4 =
37. 37.31 × 8 =
38. 38.88 × 4 =
39. 39.35 × 8 =
40. 40.74 × 8 =

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