Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 30 · 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 × 12 =
2. 2.17 × 12 =
3. 3.13 × 14 =
4. 4.48 × 15 =
5. 5.35 × 12 =
6. 6.27 × 18 =
7. 7.15 × 12 =
8. 8.41 × 12 =
9. 9.28 × 18 =
10. 10.46 × 15 =
11. 11.14 × 24 =
12. 12.19 × 12 =
13. 13.32 × 18 =
14. 14.20 × 18 =
15. 15.34 × 15 =
16. 16.37 × 12 =
17. 17.29 × 15 =
18. 18.36 × 18 =
19. 19.18 × 24 =
20. 20.12 × 14 =
21. 21.18 × 18 =
22. 22.39 × 14 =
23. 23.47 × 16 =
24. 24.35 × 18 =
25. 25.22 × 12 =
26. 26.48 × 16 =
27. 27.47 × 15 =
28. 28.49 × 24 =
29. 29.21 × 12 =
30. 30.42 × 14 =
31. 31.15 × 14 =
32. 32.49 × 15 =
33. 33.26 × 15 =
34. 34.11 × 14 =
35. 35.14 × 12 =
36. 36.41 × 14 =
37. 37.32 × 15 =
38. 38.21 × 15 =
39. 39.14 × 15 =
40. 40.48 × 24 =

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