Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 436 · 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. 1.28 × 16 =
2. 2.26 × 24 =
3. 3.23 × 24 =
4. 4.47 × 15 =
5. 5.47 × 14 =
6. 6.46 × 12 =
7. 7.14 × 15 =
8. 8.40 × 15 =
9. 9.11 × 18 =
10. 10.27 × 15 =
11. 11.37 × 12 =
12. 12.33 × 15 =
13. 13.31 × 14 =
14. 14.11 × 16 =
15. 15.36 × 12 =
16. 16.21 × 12 =
17. 17.49 × 15 =
18. 18.22 × 18 =
19. 19.44 × 24 =
20. 20.42 × 12 =
21. 21.48 × 18 =
22. 22.13 × 18 =
23. 23.12 × 16 =
24. 24.15 × 15 =
25. 25.31 × 24 =
26. 26.25 × 12 =
27. 27.24 × 14 =
28. 28.18 × 15 =
29. 29.15 × 24 =
30. 30.29 × 12 =
31. 31.21 × 16 =
32. 32.19 × 18 =
33. 33.24 × 18 =
34. 34.31 × 16 =
35. 35.19 × 24 =
36. 36.44 × 15 =
37. 37.29 × 14 =
38. 38.19 × 12 =
39. 39.24 × 16 =
40. 40.11 × 24 =

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