Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 235 · 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. 1.17 × 12 =
2. 2.14 × 15 =
3. 3.33 × 12 =
4. 4.44 × 14 =
5. 5.12 × 18 =
6. 6.43 × 15 =
7. 7.41 × 16 =
8. 8.29 × 12 =
9. 9.18 × 24 =
10. 10.12 × 14 =
11. 11.17 × 16 =
12. 12.18 × 14 =
13. 13.47 × 16 =
14. 14.22 × 18 =
15. 15.48 × 16 =
16. 16.24 × 18 =
17. 17.29 × 16 =
18. 18.37 × 18 =
19. 19.32 × 24 =
20. 20.34 × 18 =
21. 21.41 × 12 =
22. 22.38 × 14 =
23. 23.49 × 24 =
24. 24.49 × 15 =
25. 25.21 × 16 =
26. 26.12 × 12 =
27. 27.27 × 24 =
28. 28.42 × 14 =
29. 29.17 × 14 =
30. 30.11 × 24 =
31. 31.12 × 16 =
32. 32.28 × 16 =
33. 33.47 × 24 =
34. 34.49 × 16 =
35. 35.20 × 16 =
36. 36.42 × 18 =
37. 37.18 × 15 =
38. 38.36 × 12 =
39. 39.30 × 18 =
40. 40.19 × 14 =

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