Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 770 · 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 × 15 =
2. 2.16 × 24 =
3. 3.17 × 24 =
4. 4.34 × 12 =
5. 5.26 × 12 =
6. 6.42 × 14 =
7. 7.45 × 12 =
8. 8.12 × 24 =
9. 9.29 × 14 =
10. 10.21 × 15 =
11. 11.15 × 16 =
12. 12.22 × 15 =
13. 13.13 × 24 =
14. 14.45 × 14 =
15. 15.13 × 14 =
16. 16.22 × 14 =
17. 17.39 × 16 =
18. 18.33 × 15 =
19. 19.31 × 15 =
20. 20.12 × 16 =
21. 21.17 × 15 =
22. 22.19 × 14 =
23. 23.24 × 16 =
24. 24.30 × 16 =
25. 25.13 × 16 =
26. 26.26 × 16 =
27. 27.16 × 14 =
28. 28.41 × 12 =
29. 29.28 × 16 =
30. 30.27 × 14 =
31. 31.36 × 15 =
32. 32.15 × 18 =
33. 33.49 × 12 =
34. 34.14 × 24 =
35. 35.13 × 15 =
36. 36.48 × 15 =
37. 37.37 × 16 =
38. 38.19 × 16 =
39. 39.40 × 18 =
40. 40.49 × 18 =

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