Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 270 · 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. 1.15 × 14 =
2. 2.12 × 16 =
3. 3.28 × 12 =
4. 4.24 × 16 =
5. 5.25 × 16 =
6. 6.30 × 15 =
7. 7.27 × 16 =
8. 8.22 × 14 =
9. 9.18 × 14 =
10. 10.27 × 24 =
11. 11.16 × 18 =
12. 12.15 × 15 =
13. 13.43 × 18 =
14. 14.30 × 18 =
15. 15.23 × 15 =
16. 16.44 × 12 =
17. 17.31 × 12 =
18. 18.19 × 16 =
19. 19.38 × 15 =
20. 20.21 × 18 =
21. 21.11 × 18 =
22. 22.19 × 15 =
23. 23.41 × 12 =
24. 24.31 × 15 =
25. 25.28 × 24 =
26. 26.32 × 12 =
27. 27.29 × 24 =
28. 28.14 × 12 =
29. 29.39 × 15 =
30. 30.12 × 14 =
31. 31.25 × 24 =
32. 32.46 × 24 =
33. 33.12 × 12 =
34. 34.34 × 15 =
35. 35.11 × 24 =
36. 36.27 × 14 =
37. 37.17 × 12 =
38. 38.13 × 15 =
39. 39.36 × 14 =
40. 40.46 × 15 =

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