Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 495 · 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 × 24 =
2. 2.27 × 12 =
3. 3.42 × 14 =
4. 4.47 × 12 =
5. 5.23 × 16 =
6. 6.32 × 16 =
7. 7.48 × 14 =
8. 8.21 × 14 =
9. 9.19 × 12 =
10. 10.39 × 12 =
11. 11.18 × 12 =
12. 12.36 × 18 =
13. 13.15 × 16 =
14. 14.43 × 24 =
15. 15.24 × 14 =
16. 16.28 × 15 =
17. 17.38 × 24 =
18. 18.31 × 18 =
19. 19.49 × 14 =
20. 20.15 × 12 =
21. 21.45 × 15 =
22. 22.14 × 16 =
23. 23.12 × 24 =
24. 24.19 × 16 =
25. 25.47 × 14 =
26. 26.45 × 12 =
27. 27.42 × 18 =
28. 28.42 × 15 =
29. 29.20 × 18 =
30. 30.34 × 15 =
31. 31.22 × 15 =
32. 32.34 × 14 =
33. 33.29 × 24 =
34. 34.17 × 24 =
35. 35.44 × 24 =
36. 36.42 × 16 =
37. 37.17 × 16 =
38. 38.41 × 24 =
39. 39.35 × 15 =
40. 40.29 × 12 =

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