Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 439 · 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. 1.46 × 15 =
2. 2.24 × 12 =
3. 3.27 × 14 =
4. 4.30 × 12 =
5. 5.47 × 24 =
6. 6.26 × 16 =
7. 7.19 × 24 =
8. 8.13 × 16 =
9. 9.41 × 24 =
10. 10.21 × 16 =
11. 11.49 × 24 =
12. 12.32 × 16 =
13. 13.12 × 18 =
14. 14.16 × 16 =
15. 15.33 × 18 =
16. 16.20 × 18 =
17. 17.48 × 12 =
18. 18.33 × 12 =
19. 19.42 × 12 =
20. 20.36 × 24 =
21. 21.27 × 18 =
22. 22.21 × 12 =
23. 23.15 × 14 =
24. 24.41 × 14 =
25. 25.31 × 18 =
26. 26.12 × 12 =
27. 27.34 × 18 =
28. 28.39 × 14 =
29. 29.18 × 12 =
30. 30.11 × 18 =
31. 31.11 × 24 =
32. 32.45 × 15 =
33. 33.17 × 12 =
34. 34.37 × 18 =
35. 35.16 × 18 =
36. 36.41 × 12 =
37. 37.25 × 14 =
38. 38.43 × 14 =
39. 39.17 × 14 =
40. 40.35 × 12 =

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