Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 225 · 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. 1.23 × 24 =
2. 2.19 × 15 =
3. 3.29 × 14 =
4. 4.13 × 14 =
5. 5.41 × 14 =
6. 6.43 × 24 =
7. 7.14 × 15 =
8. 8.28 × 14 =
9. 9.41 × 18 =
10. 10.45 × 14 =
11. 11.34 × 15 =
12. 12.20 × 16 =
13. 13.14 × 14 =
14. 14.27 × 15 =
15. 15.47 × 14 =
16. 16.21 × 14 =
17. 17.19 × 14 =
18. 18.26 × 16 =
19. 19.21 × 18 =
20. 20.22 × 12 =
21. 21.47 × 12 =
22. 22.43 × 15 =
23. 23.41 × 16 =
24. 24.49 × 18 =
25. 25.39 × 12 =
26. 26.36 × 24 =
27. 27.42 × 12 =
28. 28.37 × 24 =
29. 29.48 × 18 =
30. 30.33 × 18 =
31. 31.12 × 15 =
32. 32.25 × 12 =
33. 33.44 × 15 =
34. 34.14 × 16 =
35. 35.36 × 18 =
36. 36.23 × 15 =
37. 37.31 × 15 =
38. 38.41 × 15 =
39. 39.12 × 14 =
40. 40.30 × 15 =

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