Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 14 · 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. 1.110 × 4 =
2. 2.35 × 4 =
3. 3.46 × 4 =
4. 4.55 × 8 =
5. 5.13 × 4 =
6. 6.88 × 4 =
7. 7.55 × 8 =
8. 8.45 × 8 =
9. 9.45 × 8 =
10. 10.40 × 4 =
11. 11.53 × 8 =
12. 12.60 × 4 =
13. 13.72 × 8 =
14. 14.160 × 4 =
15. 15.146 × 4 =
16. 16.132 × 4 =
17. 17.20 × 8 =
18. 18.25 × 8 =
19. 19.74 × 8 =
20. 20.47 × 4 =
21. 21.27 × 4 =
22. 22.31 × 8 =
23. 23.29 × 8 =
24. 24.119 × 4 =
25. 25.46 × 8 =
26. 26.92 × 4 =
27. 27.21 × 8 =
28. 28.57 × 4 =
29. 29.37 × 4 =
30. 30.31 × 8 =
31. 31.38 × 8 =
32. 32.65 × 8 =
33. 33.56 × 4 =
34. 34.48 × 8 =
35. 35.24 × 8 =
36. 36.101 × 4 =
37. 37.69 × 4 =
38. 38.73 × 4 =
39. 39.75 × 8 =
40. 40.38 × 8 =

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