Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 247 · 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. 1.42 × 24 =
2. 2.47 × 12 =
3. 3.12 × 16 =
4. 4.38 × 16 =
5. 5.14 × 12 =
6. 6.15 × 12 =
7. 7.34 × 24 =
8. 8.19 × 24 =
9. 9.37 × 14 =
10. 10.20 × 16 =
11. 11.38 × 15 =
12. 12.39 × 18 =
13. 13.33 × 18 =
14. 14.35 × 14 =
15. 15.17 × 15 =
16. 16.35 × 18 =
17. 17.19 × 18 =
18. 18.13 × 18 =
19. 19.20 × 14 =
20. 20.33 × 15 =
21. 21.37 × 15 =
22. 22.11 × 18 =
23. 23.42 × 12 =
24. 24.38 × 12 =
25. 25.13 × 24 =
26. 26.25 × 16 =
27. 27.11 × 14 =
28. 28.44 × 24 =
29. 29.21 × 18 =
30. 30.36 × 12 =
31. 31.18 × 12 =
32. 32.40 × 14 =
33. 33.41 × 12 =
34. 34.46 × 15 =
35. 35.27 × 12 =
36. 36.48 × 12 =
37. 37.13 × 12 =
38. 38.46 × 14 =
39. 39.31 × 12 =
40. 40.14 × 16 =

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