Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 385 · 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. 1.39 × 18 =
2. 2.12 × 16 =
3. 3.16 × 12 =
4. 4.49 × 14 =
5. 5.31 × 15 =
6. 6.42 × 16 =
7. 7.27 × 12 =
8. 8.29 × 15 =
9. 9.35 × 15 =
10. 10.30 × 14 =
11. 11.19 × 24 =
12. 12.31 × 12 =
13. 13.15 × 14 =
14. 14.34 × 18 =
15. 15.23 × 12 =
16. 16.20 × 14 =
17. 17.26 × 14 =
18. 18.49 × 18 =
19. 19.33 × 14 =
20. 20.30 × 12 =
21. 21.38 × 14 =
22. 22.41 × 18 =
23. 23.28 × 14 =
24. 24.34 × 24 =
25. 25.42 × 24 =
26. 26.41 × 14 =
27. 27.15 × 12 =
28. 28.13 × 15 =
29. 29.27 × 15 =
30. 30.39 × 12 =
31. 31.18 × 14 =
32. 32.47 × 24 =
33. 33.42 × 18 =
34. 34.14 × 15 =
35. 35.40 × 12 =
36. 36.46 × 24 =
37. 37.28 × 18 =
38. 38.48 × 18 =
39. 39.21 × 18 =
40. 40.14 × 24 =

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