Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 872 · 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. 1.13 × 12 =
2. 2.20 × 14 =
3. 3.23 × 18 =
4. 4.13 × 24 =
5. 5.48 × 14 =
6. 6.17 × 12 =
7. 7.36 × 16 =
8. 8.19 × 14 =
9. 9.41 × 16 =
10. 10.30 × 12 =
11. 11.20 × 18 =
12. 12.27 × 15 =
13. 13.23 × 14 =
14. 14.11 × 12 =
15. 15.33 × 12 =
16. 16.13 × 15 =
17. 17.30 × 16 =
18. 18.12 × 16 =
19. 19.33 × 14 =
20. 20.26 × 24 =
21. 21.40 × 16 =
22. 22.11 × 24 =
23. 23.31 × 18 =
24. 24.13 × 16 =
25. 25.17 × 15 =
26. 26.25 × 24 =
27. 27.33 × 15 =
28. 28.34 × 14 =
29. 29.40 × 18 =
30. 30.49 × 14 =
31. 31.33 × 18 =
32. 32.31 × 14 =
33. 33.27 × 12 =
34. 34.49 × 16 =
35. 35.34 × 24 =
36. 36.42 × 24 =
37. 37.17 × 16 =
38. 38.25 × 18 =
39. 39.46 × 12 =
40. 40.14 × 18 =

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