Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 803 · 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. 1.37 × 14 =
2. 2.14 × 24 =
3. 3.16 × 24 =
4. 4.14 × 16 =
5. 5.20 × 24 =
6. 6.12 × 15 =
7. 7.16 × 15 =
8. 8.28 × 14 =
9. 9.48 × 15 =
10. 10.24 × 12 =
11. 11.42 × 24 =
12. 12.23 × 15 =
13. 13.27 × 24 =
14. 14.39 × 18 =
15. 15.26 × 15 =
16. 16.44 × 15 =
17. 17.41 × 12 =
18. 18.36 × 14 =
19. 19.47 × 16 =
20. 20.22 × 12 =
21. 21.31 × 14 =
22. 22.42 × 12 =
23. 23.38 × 15 =
24. 24.36 × 24 =
25. 25.13 × 24 =
26. 26.48 × 16 =
27. 27.33 × 15 =
28. 28.19 × 12 =
29. 29.46 × 16 =
30. 30.33 × 12 =
31. 31.49 × 24 =
32. 32.21 × 12 =
33. 33.41 × 14 =
34. 34.19 × 14 =
35. 35.41 × 16 =
36. 36.33 × 24 =
37. 37.12 × 14 =
38. 38.35 × 15 =
39. 39.18 × 12 =
40. 40.15 × 15 =

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