Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 853 · 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. 1.24 × 14 =
2. 2.21 × 16 =
3. 3.30 × 15 =
4. 4.11 × 12 =
5. 5.40 × 18 =
6. 6.43 × 12 =
7. 7.30 × 24 =
8. 8.18 × 14 =
9. 9.22 × 16 =
10. 10.44 × 14 =
11. 11.27 × 12 =
12. 12.36 × 14 =
13. 13.39 × 14 =
14. 14.33 × 16 =
15. 15.29 × 12 =
16. 16.31 × 15 =
17. 17.49 × 12 =
18. 18.16 × 14 =
19. 19.12 × 12 =
20. 20.32 × 16 =
21. 21.27 × 14 =
22. 22.26 × 14 =
23. 23.39 × 12 =
24. 24.17 × 15 =
25. 25.43 × 15 =
26. 26.22 × 18 =
27. 27.48 × 12 =
28. 28.19 × 24 =
29. 29.49 × 16 =
30. 30.33 × 12 =
31. 31.45 × 16 =
32. 32.46 × 14 =
33. 33.18 × 24 =
34. 34.33 × 24 =
35. 35.46 × 12 =
36. 36.16 × 16 =
37. 37.17 × 16 =
38. 38.39 × 18 =
39. 39.15 × 18 =
40. 40.24 × 24 =

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