Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 117 · 40 questions

The trick (Chain the factors): Split the multiplier into two small factors: 12 = 3 × 4, 14 = 2 × 7, 15 = 3 × 5, 16 = 4 × 4, 18 = 2 × 9, 24 = 4 × 6. Multiply by the first factor. Multiply that answer by the second factor (× 4 is double, double).

1. 1.28 × 16 =
2. 2.35 × 16 =
3. 3.30 × 24 =
4. 4.31 × 15 =
5. 5.32 × 16 =
6. 6.11 × 24 =
7. 7.24 × 18 =
8. 8.11 × 16 =
9. 9.37 × 12 =
10. 10.20 × 12 =
11. 11.39 × 12 =
12. 12.22 × 18 =
13. 13.14 × 14 =
14. 14.22 × 16 =
15. 15.12 × 18 =
16. 16.14 × 16 =
17. 17.49 × 16 =
18. 18.14 × 18 =
19. 19.14 × 15 =
20. 20.12 × 16 =
21. 21.43 × 24 =
22. 22.39 × 16 =
23. 23.24 × 12 =
24. 24.26 × 16 =
25. 25.15 × 12 =
26. 26.33 × 18 =
27. 27.47 × 15 =
28. 28.31 × 16 =
29. 29.13 × 15 =
30. 30.41 × 12 =
31. 31.49 × 14 =
32. 32.36 × 12 =
33. 33.19 × 15 =
34. 34.32 × 18 =
35. 35.41 × 18 =
36. 36.42 × 14 =
37. 37.46 × 14 =
38. 38.21 × 14 =
39. 39.24 × 24 =
40. 40.31 × 14 =

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