Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 503 · 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. 1.49 × 24 =
2. 2.13 × 24 =
3. 3.47 × 18 =
4. 4.16 × 12 =
5. 5.17 × 14 =
6. 6.40 × 16 =
7. 7.12 × 12 =
8. 8.24 × 12 =
9. 9.12 × 24 =
10. 10.28 × 14 =
11. 11.39 × 14 =
12. 12.11 × 18 =
13. 13.39 × 12 =
14. 14.46 × 18 =
15. 15.47 × 12 =
16. 16.13 × 14 =
17. 17.11 × 15 =
18. 18.28 × 16 =
19. 19.37 × 15 =
20. 20.26 × 15 =
21. 21.17 × 15 =
22. 22.19 × 18 =
23. 23.14 × 24 =
24. 24.40 × 18 =
25. 25.48 × 16 =
26. 26.33 × 24 =
27. 27.21 × 12 =
28. 28.45 × 14 =
29. 29.23 × 16 =
30. 30.30 × 14 =
31. 31.44 × 14 =
32. 32.21 × 14 =
33. 33.39 × 18 =
34. 34.29 × 16 =
35. 35.30 × 16 =
36. 36.38 × 14 =
37. 37.39 × 24 =
38. 38.18 × 12 =
39. 39.43 × 14 =
40. 40.16 × 14 =

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