Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 943 · 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. 1.146 × 4 =
2. 2.43 × 4 =
3. 3.26 × 8 =
4. 4.68 × 8 =
5. 5.19 × 8 =
6. 6.127 × 4 =
7. 7.73 × 4 =
8. 8.39 × 4 =
9. 9.64 × 8 =
10. 10.76 × 4 =
11. 11.62 × 8 =
12. 12.36 × 4 =
13. 13.114 × 4 =
14. 14.111 × 4 =
15. 15.28 × 4 =
16. 16.47 × 4 =
17. 17.20 × 8 =
18. 18.36 × 8 =
19. 19.36 × 8 =
20. 20.128 × 4 =
21. 21.52 × 4 =
22. 22.91 × 4 =
23. 23.104 × 4 =
24. 24.97 × 4 =
25. 25.53 × 8 =
26. 26.15 × 8 =
27. 27.34 × 4 =
28. 28.56 × 4 =
29. 29.30 × 8 =
30. 30.89 × 4 =
31. 31.48 × 8 =
32. 32.77 × 4 =
33. 33.86 × 4 =
34. 34.49 × 4 =
35. 35.57 × 8 =
36. 36.54 × 8 =
37. 37.51 × 8 =
38. 38.71 × 4 =
39. 39.35 × 8 =
40. 40.64 × 8 =

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