Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 887 · 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. 2.25 × 24 =
3. 3.28 × 16 =
4. 4.18 × 16 =
5. 5.18 × 15 =
6. 6.25 × 18 =
7. 7.31 × 15 =
8. 8.12 × 18 =
9. 9.30 × 15 =
10. 10.36 × 16 =
11. 11.12 × 14 =
12. 12.25 × 14 =
13. 13.15 × 14 =
14. 14.27 × 16 =
15. 15.38 × 12 =
16. 16.22 × 12 =
17. 17.17 × 12 =
18. 18.14 × 14 =
19. 19.13 × 14 =
20. 20.41 × 15 =
21. 21.16 × 12 =
22. 22.48 × 16 =
23. 23.30 × 12 =
24. 24.30 × 24 =
25. 25.40 × 24 =
26. 26.31 × 16 =
27. 27.44 × 12 =
28. 28.47 × 15 =
29. 29.47 × 18 =
30. 30.37 × 18 =
31. 31.30 × 14 =
32. 32.16 × 14 =
33. 33.33 × 15 =
34. 34.37 × 16 =
35. 35.44 × 14 =
36. 36.14 × 24 =
37. 37.26 × 24 =
38. 38.39 × 12 =
39. 39.19 × 15 =
40. 40.22 × 18 =

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