Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 9 · 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. 1.19 × 14 =
2. 2.17 × 18 =
3. 3.12 × 12 =
4. 4.23 × 18 =
5. 5.48 × 14 =
6. 6.42 × 14 =
7. 7.40 × 16 =
8. 8.15 × 14 =
9. 9.34 × 15 =
10. 10.43 × 18 =
11. 11.38 × 14 =
12. 12.25 × 14 =
13. 13.25 × 18 =
14. 14.27 × 16 =
15. 15.40 × 14 =
16. 16.26 × 12 =
17. 17.15 × 18 =
18. 18.24 × 15 =
19. 19.41 × 18 =
20. 20.13 × 24 =
21. 21.25 × 12 =
22. 22.46 × 15 =
23. 23.37 × 24 =
24. 24.29 × 15 =
25. 25.41 × 14 =
26. 26.31 × 14 =
27. 27.14 × 12 =
28. 28.28 × 18 =
29. 29.34 × 12 =
30. 30.43 × 12 =
31. 31.37 × 12 =
32. 32.44 × 16 =
33. 33.45 × 24 =
34. 34.18 × 14 =
35. 35.48 × 18 =
36. 36.28 × 16 =
37. 37.34 × 16 =
38. 38.25 × 15 =
39. 39.20 × 24 =
40. 40.49 × 14 =

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