Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 485 · 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. 1.20 × 18 =
2. 2.33 × 18 =
3. 3.14 × 15 =
4. 4.18 × 12 =
5. 5.19 × 14 =
6. 6.28 × 24 =
7. 7.48 × 24 =
8. 8.46 × 12 =
9. 9.18 × 15 =
10. 10.21 × 14 =
11. 11.12 × 15 =
12. 12.39 × 18 =
13. 13.49 × 24 =
14. 14.27 × 16 =
15. 15.22 × 16 =
16. 16.23 × 16 =
17. 17.15 × 12 =
18. 18.26 × 24 =
19. 19.17 × 15 =
20. 20.33 × 24 =
21. 21.28 × 15 =
22. 22.15 × 16 =
23. 23.19 × 12 =
24. 24.24 × 14 =
25. 25.45 × 16 =
26. 26.12 × 24 =
27. 27.21 × 15 =
28. 28.34 × 12 =
29. 29.24 × 16 =
30. 30.34 × 18 =
31. 31.15 × 14 =
32. 32.25 × 15 =
33. 33.42 × 24 =
34. 34.13 × 15 =
35. 35.15 × 18 =
36. 36.12 × 18 =
37. 37.47 × 18 =
38. 38.42 × 15 =
39. 39.38 × 16 =
40. 40.15 × 15 =

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