Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 45 · 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. 1.20 × 14 =
2. 2.40 × 14 =
3. 3.14 × 14 =
4. 4.13 × 12 =
5. 5.20 × 12 =
6. 6.45 × 24 =
7. 7.37 × 18 =
8. 8.42 × 24 =
9. 9.49 × 12 =
10. 10.39 × 12 =
11. 11.28 × 14 =
12. 12.49 × 16 =
13. 13.18 × 14 =
14. 14.29 × 14 =
15. 15.21 × 12 =
16. 16.40 × 15 =
17. 17.20 × 24 =
18. 18.35 × 14 =
19. 19.17 × 14 =
20. 20.45 × 18 =
21. 21.48 × 24 =
22. 22.18 × 12 =
23. 23.12 × 18 =
24. 24.22 × 14 =
25. 25.28 × 18 =
26. 26.16 × 16 =
27. 27.34 × 15 =
28. 28.17 × 12 =
29. 29.48 × 16 =
30. 30.30 × 12 =
31. 31.38 × 14 =
32. 32.43 × 16 =
33. 33.16 × 24 =
34. 34.14 × 24 =
35. 35.27 × 16 =
36. 36.28 × 24 =
37. 37.25 × 16 =
38. 38.11 × 24 =
39. 39.29 × 24 =
40. 40.44 × 24 =

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