Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 639 · 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. 1.67 × 8 =
2. 2.13 × 4 =
3. 3.40 × 8 =
4. 4.50 × 8 =
5. 5.75 × 8 =
6. 6.54 × 8 =
7. 7.31 × 8 =
8. 8.97 × 4 =
9. 9.71 × 8 =
10. 10.74 × 4 =
11. 11.98 × 4 =
12. 12.66 × 8 =
13. 13.48 × 8 =
14. 14.112 × 4 =
15. 15.67 × 8 =
16. 16.55 × 8 =
17. 17.101 × 4 =
18. 18.102 × 4 =
19. 19.46 × 4 =
20. 20.55 × 4 =
21. 21.70 × 8 =
22. 22.20 × 8 =
23. 23.40 × 4 =
24. 24.24 × 4 =
25. 25.30 × 4 =
26. 26.57 × 8 =
27. 27.123 × 4 =
28. 28.12 × 8 =
29. 29.18 × 8 =
30. 30.51 × 8 =
31. 31.65 × 8 =
32. 32.26 × 4 =
33. 33.43 × 4 =
34. 34.74 × 4 =
35. 35.152 × 4 =
36. 36.72 × 8 =
37. 37.84 × 4 =
38. 38.74 × 4 =
39. 39.63 × 4 =
40. 40.38 × 8 =

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