Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 88 · 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. 1.20 × 14 =
2. 2.29 × 16 =
3. 3.13 × 18 =
4. 4.21 × 14 =
5. 5.31 × 14 =
6. 6.41 × 14 =
7. 7.20 × 12 =
8. 8.26 × 15 =
9. 9.36 × 14 =
10. 10.49 × 14 =
11. 11.45 × 16 =
12. 12.49 × 18 =
13. 13.15 × 16 =
14. 14.49 × 24 =
15. 15.41 × 18 =
16. 16.25 × 24 =
17. 17.22 × 14 =
18. 18.39 × 12 =
19. 19.31 × 15 =
20. 20.48 × 16 =
21. 21.19 × 12 =
22. 22.17 × 24 =
23. 23.20 × 16 =
24. 24.36 × 18 =
25. 25.30 × 14 =
26. 26.20 × 15 =
27. 27.18 × 12 =
28. 28.17 × 16 =
29. 29.16 × 14 =
30. 30.43 × 15 =
31. 31.48 × 18 =
32. 32.41 × 15 =
33. 33.48 × 12 =
34. 34.14 × 16 =
35. 35.19 × 24 =
36. 36.14 × 18 =
37. 37.31 × 24 =
38. 38.35 × 15 =
39. 39.21 × 12 =
40. 40.35 × 14 =

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