Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 355 · 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. 1.40 × 4 =
2. 2.156 × 4 =
3. 3.57 × 4 =
4. 4.14 × 8 =
5. 5.19 × 8 =
6. 6.60 × 8 =
7. 7.70 × 8 =
8. 8.16 × 8 =
9. 9.58 × 4 =
10. 10.65 × 8 =
11. 11.111 × 4 =
12. 12.52 × 8 =
13. 13.74 × 4 =
14. 14.112 × 4 =
15. 15.69 × 8 =
16. 16.24 × 4 =
17. 17.22 × 4 =
18. 18.34 × 4 =
19. 19.97 × 4 =
20. 20.58 × 8 =
21. 21.38 × 4 =
22. 22.115 × 4 =
23. 23.22 × 4 =
24. 24.23 × 8 =
25. 25.56 × 8 =
26. 26.44 × 8 =
27. 27.26 × 8 =
28. 28.36 × 8 =
29. 29.46 × 8 =
30. 30.36 × 4 =
31. 31.20 × 8 =
32. 32.115 × 4 =
33. 33.39 × 8 =
34. 34.70 × 8 =
35. 35.21 × 8 =
36. 36.50 × 4 =
37. 37.69 × 8 =
38. 38.93 × 4 =
39. 39.119 × 4 =
40. 40.32 × 4 =

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