Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 440 · 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 × 15 =
2. 2.44 × 14 =
3. 3.49 × 16 =
4. 4.46 × 12 =
5. 5.48 × 14 =
6. 6.18 × 16 =
7. 7.14 × 18 =
8. 8.43 × 16 =
9. 9.12 × 15 =
10. 10.24 × 16 =
11. 11.18 × 14 =
12. 12.16 × 24 =
13. 13.31 × 14 =
14. 14.25 × 18 =
15. 15.14 × 15 =
16. 16.35 × 14 =
17. 17.32 × 12 =
18. 18.23 × 16 =
19. 19.17 × 18 =
20. 20.41 × 14 =
21. 21.14 × 24 =
22. 22.28 × 12 =
23. 23.29 × 12 =
24. 24.23 × 18 =
25. 25.37 × 15 =
26. 26.25 × 14 =
27. 27.19 × 18 =
28. 28.19 × 16 =
29. 29.19 × 12 =
30. 30.33 × 18 =
31. 31.31 × 12 =
32. 32.33 × 12 =
33. 33.39 × 18 =
34. 34.32 × 16 =
35. 35.24 × 14 =
36. 36.42 × 16 =
37. 37.39 × 12 =
38. 38.32 × 24 =
39. 39.20 × 18 =
40. 40.39 × 16 =

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