Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 839 · 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. 1.40 × 12 =
2. 2.25 × 15 =
3. 3.36 × 14 =
4. 4.19 × 14 =
5. 5.17 × 14 =
6. 6.42 × 14 =
7. 7.38 × 14 =
8. 8.17 × 15 =
9. 9.15 × 24 =
10. 10.22 × 12 =
11. 11.35 × 18 =
12. 12.24 × 18 =
13. 13.18 × 24 =
14. 14.39 × 12 =
15. 15.34 × 15 =
16. 16.15 × 15 =
17. 17.20 × 12 =
18. 18.21 × 12 =
19. 19.23 × 15 =
20. 20.22 × 24 =
21. 21.36 × 16 =
22. 22.21 × 15 =
23. 23.13 × 15 =
24. 24.17 × 24 =
25. 25.33 × 15 =
26. 26.16 × 15 =
27. 27.36 × 12 =
28. 28.33 × 12 =
29. 29.43 × 24 =
30. 30.18 × 14 =
31. 31.18 × 18 =
32. 32.49 × 14 =
33. 33.12 × 15 =
34. 34.44 × 14 =
35. 35.17 × 16 =
36. 36.14 × 18 =
37. 37.49 × 12 =
38. 38.14 × 14 =
39. 39.28 × 15 =
40. 40.35 × 14 =

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