Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 336 · 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. 1.43 × 18 =
2. 2.43 × 14 =
3. 3.49 × 24 =
4. 4.46 × 15 =
5. 5.11 × 15 =
6. 6.17 × 18 =
7. 7.24 × 24 =
8. 8.16 × 15 =
9. 9.14 × 16 =
10. 10.39 × 24 =
11. 11.42 × 12 =
12. 12.23 × 12 =
13. 13.28 × 24 =
14. 14.28 × 15 =
15. 15.39 × 12 =
16. 16.14 × 15 =
17. 17.45 × 15 =
18. 18.33 × 24 =
19. 19.20 × 14 =
20. 20.34 × 15 =
21. 21.45 × 14 =
22. 22.26 × 24 =
23. 23.20 × 15 =
24. 24.49 × 14 =
25. 25.11 × 24 =
26. 26.41 × 14 =
27. 27.11 × 14 =
28. 28.15 × 24 =
29. 29.37 × 16 =
30. 30.46 × 12 =
31. 31.28 × 18 =
32. 32.31 × 12 =
33. 33.17 × 14 =
34. 34.38 × 12 =
35. 35.41 × 16 =
36. 36.24 × 15 =
37. 37.44 × 12 =
38. 38.13 × 18 =
39. 39.31 × 24 =
40. 40.47 × 12 =

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