Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 181 · 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. 1.24 × 15 =
2. 2.14 × 14 =
3. 3.32 × 14 =
4. 4.15 × 18 =
5. 5.21 × 15 =
6. 6.11 × 18 =
7. 7.47 × 15 =
8. 8.13 × 12 =
9. 9.19 × 24 =
10. 10.32 × 12 =
11. 11.38 × 14 =
12. 12.37 × 12 =
13. 13.21 × 12 =
14. 14.21 × 18 =
15. 15.20 × 15 =
16. 16.19 × 12 =
17. 17.36 × 15 =
18. 18.13 × 16 =
19. 19.36 × 24 =
20. 20.41 × 16 =
21. 21.23 × 14 =
22. 22.26 × 24 =
23. 23.26 × 14 =
24. 24.34 × 12 =
25. 25.39 × 14 =
26. 26.42 × 24 =
27. 27.14 × 12 =
28. 28.30 × 12 =
29. 29.38 × 15 =
30. 30.16 × 16 =
31. 31.29 × 16 =
32. 32.14 × 24 =
33. 33.22 × 24 =
34. 34.34 × 14 =
35. 35.11 × 15 =
36. 36.14 × 16 =
37. 37.28 × 16 =
38. 38.17 × 15 =
39. 39.15 × 15 =
40. 40.12 × 16 =

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