Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 866 · 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. 1.38 × 14 =
2. 2.25 × 16 =
3. 3.33 × 16 =
4. 4.16 × 14 =
5. 5.19 × 14 =
6. 6.29 × 12 =
7. 7.30 × 16 =
8. 8.47 × 16 =
9. 9.14 × 15 =
10. 10.21 × 24 =
11. 11.45 × 14 =
12. 12.12 × 18 =
13. 13.12 × 15 =
14. 14.45 × 12 =
15. 15.25 × 24 =
16. 16.16 × 16 =
17. 17.46 × 14 =
18. 18.43 × 12 =
19. 19.33 × 24 =
20. 20.22 × 14 =
21. 21.39 × 24 =
22. 22.43 × 24 =
23. 23.13 × 12 =
24. 24.27 × 12 =
25. 25.41 × 12 =
26. 26.30 × 12 =
27. 27.20 × 14 =
28. 28.13 × 24 =
29. 29.25 × 14 =
30. 30.13 × 16 =
31. 31.41 × 18 =
32. 32.12 × 16 =
33. 33.24 × 15 =
34. 34.17 × 16 =
35. 35.23 × 16 =
36. 36.24 × 14 =
37. 37.20 × 24 =
38. 38.17 × 14 =
39. 39.49 × 12 =
40. 40.34 × 18 =

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