Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 501 · 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. 1.21 × 18 =
2. 2.24 × 14 =
3. 3.15 × 16 =
4. 4.37 × 16 =
5. 5.21 × 12 =
6. 6.25 × 14 =
7. 7.46 × 14 =
8. 8.11 × 12 =
9. 9.47 × 15 =
10. 10.26 × 24 =
11. 11.48 × 18 =
12. 12.45 × 12 =
13. 13.36 × 18 =
14. 14.40 × 24 =
15. 15.37 × 18 =
16. 16.31 × 12 =
17. 17.22 × 12 =
18. 18.15 × 15 =
19. 19.49 × 12 =
20. 20.29 × 24 =
21. 21.45 × 14 =
22. 22.28 × 14 =
23. 23.33 × 15 =
24. 24.42 × 12 =
25. 25.24 × 24 =
26. 26.12 × 16 =
27. 27.47 × 18 =
28. 28.29 × 14 =
29. 29.17 × 16 =
30. 30.29 × 12 =
31. 31.15 × 12 =
32. 32.12 × 12 =
33. 33.42 × 24 =
34. 34.17 × 18 =
35. 35.46 × 15 =
36. 36.26 × 12 =
37. 37.27 × 14 =
38. 38.26 × 16 =
39. 39.32 × 18 =
40. 40.38 × 14 =

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