Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 753 · 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. 1.19 × 18 =
2. 2.25 × 14 =
3. 3.24 × 24 =
4. 4.24 × 14 =
5. 5.22 × 15 =
6. 6.44 × 18 =
7. 7.42 × 16 =
8. 8.46 × 18 =
9. 9.13 × 14 =
10. 10.27 × 16 =
11. 11.26 × 14 =
12. 12.47 × 12 =
13. 13.43 × 18 =
14. 14.49 × 15 =
15. 15.21 × 14 =
16. 16.40 × 24 =
17. 17.12 × 18 =
18. 18.14 × 12 =
19. 19.48 × 18 =
20. 20.44 × 15 =
21. 21.11 × 18 =
22. 22.31 × 16 =
23. 23.14 × 18 =
24. 24.41 × 18 =
25. 25.22 × 18 =
26. 26.25 × 12 =
27. 27.13 × 16 =
28. 28.36 × 15 =
29. 29.29 × 15 =
30. 30.39 × 16 =
31. 31.42 × 24 =
32. 32.16 × 15 =
33. 33.18 × 12 =
34. 34.23 × 24 =
35. 35.21 × 15 =
36. 36.36 × 24 =
37. 37.20 × 18 =
38. 38.33 × 24 =
39. 39.28 × 24 =
40. 40.33 × 15 =

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