Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 322 · 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. 1.43 × 14 =
2. 2.22 × 14 =
3. 3.16 × 14 =
4. 4.39 × 12 =
5. 5.41 × 15 =
6. 6.49 × 14 =
7. 7.34 × 18 =
8. 8.37 × 15 =
9. 9.37 × 24 =
10. 10.35 × 16 =
11. 11.13 × 16 =
12. 12.15 × 18 =
13. 13.48 × 24 =
14. 14.34 × 16 =
15. 15.31 × 14 =
16. 16.24 × 15 =
17. 17.48 × 14 =
18. 18.33 × 24 =
19. 19.44 × 18 =
20. 20.44 × 14 =
21. 21.31 × 24 =
22. 22.26 × 15 =
23. 23.47 × 12 =
24. 24.16 × 16 =
25. 25.31 × 18 =
26. 26.17 × 24 =
27. 27.46 × 12 =
28. 28.12 × 12 =
29. 29.13 × 15 =
30. 30.11 × 14 =
31. 31.48 × 18 =
32. 32.46 × 24 =
33. 33.49 × 24 =
34. 34.45 × 18 =
35. 35.33 × 14 =
36. 36.32 × 12 =
37. 37.23 × 12 =
38. 38.45 × 16 =
39. 39.33 × 12 =
40. 40.11 × 16 =

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