Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 321 · 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. 1.40 × 18 =
2. 2.17 × 15 =
3. 3.39 × 16 =
4. 4.48 × 16 =
5. 5.22 × 14 =
6. 6.11 × 15 =
7. 7.28 × 24 =
8. 8.24 × 14 =
9. 9.11 × 12 =
10. 10.13 × 14 =
11. 11.19 × 18 =
12. 12.49 × 18 =
13. 13.48 × 24 =
14. 14.16 × 12 =
15. 15.31 × 18 =
16. 16.36 × 15 =
17. 17.14 × 12 =
18. 18.36 × 24 =
19. 19.45 × 16 =
20. 20.14 × 24 =
21. 21.19 × 15 =
22. 22.47 × 24 =
23. 23.39 × 14 =
24. 24.46 × 24 =
25. 25.17 × 24 =
26. 26.24 × 18 =
27. 27.15 × 15 =
28. 28.37 × 12 =
29. 29.25 × 18 =
30. 30.47 × 18 =
31. 31.40 × 14 =
32. 32.12 × 16 =
33. 33.34 × 18 =
34. 34.20 × 16 =
35. 35.45 × 12 =
36. 36.17 × 16 =
37. 37.22 × 16 =
38. 38.23 × 15 =
39. 39.32 × 16 =
40. 40.27 × 18 =

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