Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 134 · 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 × 15 =
2. 2.18 × 18 =
3. 3.33 × 18 =
4. 4.18 × 12 =
5. 5.37 × 14 =
6. 6.26 × 14 =
7. 7.43 × 12 =
8. 8.34 × 14 =
9. 9.25 × 14 =
10. 10.12 × 24 =
11. 11.16 × 12 =
12. 12.40 × 18 =
13. 13.49 × 12 =
14. 14.23 × 18 =
15. 15.41 × 16 =
16. 16.45 × 14 =
17. 17.43 × 15 =
18. 18.48 × 18 =
19. 19.38 × 12 =
20. 20.39 × 12 =
21. 21.21 × 24 =
22. 22.14 × 18 =
23. 23.28 × 14 =
24. 24.28 × 18 =
25. 25.13 × 18 =
26. 26.31 × 18 =
27. 27.16 × 16 =
28. 28.43 × 18 =
29. 29.30 × 12 =
30. 30.25 × 18 =
31. 31.38 × 14 =
32. 32.14 × 15 =
33. 33.36 × 18 =
34. 34.12 × 14 =
35. 35.44 × 12 =
36. 36.13 × 24 =
37. 37.22 × 18 =
38. 38.38 × 18 =
39. 39.16 × 24 =
40. 40.21 × 15 =

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