Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 154 · 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. 2.20 × 12 =
3. 3.31 × 14 =
4. 4.28 × 14 =
5. 5.49 × 15 =
6. 6.47 × 18 =
7. 7.35 × 12 =
8. 8.43 × 16 =
9. 9.19 × 14 =
10. 10.49 × 18 =
11. 11.27 × 14 =
12. 12.39 × 16 =
13. 13.36 × 18 =
14. 14.46 × 18 =
15. 15.36 × 16 =
16. 16.31 × 18 =
17. 17.27 × 15 =
18. 18.28 × 12 =
19. 19.15 × 24 =
20. 20.42 × 24 =
21. 21.35 × 18 =
22. 22.13 × 15 =
23. 23.31 × 16 =
24. 24.20 × 14 =
25. 25.43 × 18 =
26. 26.16 × 14 =
27. 27.21 × 14 =
28. 28.12 × 18 =
29. 29.38 × 14 =
30. 30.41 × 16 =
31. 31.47 × 15 =
32. 32.33 × 14 =
33. 33.20 × 16 =
34. 34.11 × 24 =
35. 35.39 × 15 =
36. 36.22 × 16 =
37. 37.26 × 15 =
38. 38.43 × 15 =
39. 39.35 × 14 =
40. 40.29 × 14 =

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