Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 843 · 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. 1.74 × 8 =
2. 2.73 × 4 =
3. 3.18 × 8 =
4. 4.38 × 4 =
5. 5.88 × 4 =
6. 6.15 × 8 =
7. 7.133 × 4 =
8. 8.28 × 8 =
9. 9.53 × 4 =
10. 10.41 × 8 =
11. 11.72 × 8 =
12. 12.105 × 4 =
13. 13.37 × 8 =
14. 14.15 × 8 =
15. 15.41 × 8 =
16. 16.47 × 8 =
17. 17.15 × 8 =
18. 18.123 × 4 =
19. 19.37 × 4 =
20. 20.65 × 4 =
21. 21.134 × 4 =
22. 22.18 × 4 =
23. 23.19 × 8 =
24. 24.32 × 4 =
25. 25.116 × 4 =
26. 26.42 × 8 =
27. 27.63 × 8 =
28. 28.14 × 8 =
29. 29.54 × 4 =
30. 30.87 × 4 =
31. 31.45 × 8 =
32. 32.56 × 8 =
33. 33.13 × 8 =
34. 34.31 × 8 =
35. 35.70 × 8 =
36. 36.70 × 4 =
37. 37.132 × 4 =
38. 38.80 × 4 =
39. 39.60 × 8 =
40. 40.48 × 8 =

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