Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 428 · 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. 1.12 × 14 =
2. 2.27 × 16 =
3. 3.37 × 12 =
4. 4.12 × 12 =
5. 5.46 × 18 =
6. 6.40 × 15 =
7. 7.34 × 24 =
8. 8.26 × 24 =
9. 9.31 × 18 =
10. 10.48 × 15 =
11. 11.12 × 18 =
12. 12.30 × 14 =
13. 13.21 × 14 =
14. 14.32 × 14 =
15. 15.19 × 12 =
16. 16.46 × 16 =
17. 17.33 × 14 =
18. 18.28 × 15 =
19. 19.28 × 16 =
20. 20.29 × 12 =
21. 21.43 × 16 =
22. 22.45 × 14 =
23. 23.25 × 18 =
24. 24.39 × 14 =
25. 25.46 × 14 =
26. 26.13 × 15 =
27. 27.32 × 12 =
28. 28.18 × 16 =
29. 29.17 × 24 =
30. 30.15 × 18 =
31. 31.47 × 15 =
32. 32.41 × 16 =
33. 33.33 × 12 =
34. 34.26 × 12 =
35. 35.44 × 14 =
36. 36.29 × 15 =
37. 37.27 × 14 =
38. 38.49 × 18 =
39. 39.30 × 18 =
40. 40.42 × 12 =

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