Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 678 · 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. 1.27 × 12 =
2. 2.19 × 15 =
3. 3.44 × 16 =
4. 4.42 × 15 =
5. 5.36 × 18 =
6. 6.41 × 24 =
7. 7.34 × 15 =
8. 8.28 × 18 =
9. 9.49 × 16 =
10. 10.19 × 12 =
11. 11.43 × 24 =
12. 12.13 × 14 =
13. 13.29 × 12 =
14. 14.21 × 14 =
15. 15.27 × 24 =
16. 16.39 × 18 =
17. 17.28 × 16 =
18. 18.14 × 12 =
19. 19.11 × 12 =
20. 20.41 × 15 =
21. 21.48 × 12 =
22. 22.11 × 24 =
23. 23.18 × 18 =
24. 24.36 × 16 =
25. 25.41 × 12 =
26. 26.35 × 14 =
27. 27.39 × 16 =
28. 28.25 × 15 =
29. 29.34 × 12 =
30. 30.42 × 14 =
31. 31.17 × 12 =
32. 32.33 × 14 =
33. 33.19 × 18 =
34. 34.40 × 12 =
35. 35.32 × 15 =
36. 36.28 × 14 =
37. 37.14 × 14 =
38. 38.18 × 15 =
39. 39.47 × 12 =
40. 40.31 × 12 =

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