Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 172 · 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. 1.49 × 24 =
2. 2.36 × 14 =
3. 3.47 × 16 =
4. 4.36 × 24 =
5. 5.14 × 12 =
6. 6.40 × 14 =
7. 7.11 × 12 =
8. 8.22 × 12 =
9. 9.35 × 24 =
10. 10.27 × 16 =
11. 11.45 × 12 =
12. 12.21 × 15 =
13. 13.46 × 14 =
14. 14.30 × 18 =
15. 15.29 × 12 =
16. 16.43 × 15 =
17. 17.42 × 16 =
18. 18.19 × 12 =
19. 19.17 × 14 =
20. 20.20 × 12 =
21. 21.28 × 12 =
22. 22.15 × 24 =
23. 23.24 × 24 =
24. 24.31 × 14 =
25. 25.12 × 14 =
26. 26.48 × 24 =
27. 27.12 × 24 =
28. 28.24 × 18 =
29. 29.30 × 14 =
30. 30.21 × 12 =
31. 31.27 × 12 =
32. 32.21 × 24 =
33. 33.18 × 14 =
34. 34.22 × 14 =
35. 35.37 × 15 =
36. 36.48 × 12 =
37. 37.28 × 18 =
38. 38.15 × 15 =
39. 39.39 × 12 =
40. 40.33 × 24 =

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