Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 58 · 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. 1.15 × 24 =
2. 2.47 × 18 =
3. 3.16 × 12 =
4. 4.40 × 12 =
5. 5.23 × 24 =
6. 6.27 × 14 =
7. 7.32 × 12 =
8. 8.11 × 15 =
9. 9.41 × 12 =
10. 10.12 × 14 =
11. 11.17 × 15 =
12. 12.21 × 18 =
13. 13.12 × 16 =
14. 14.22 × 16 =
15. 15.12 × 12 =
16. 16.43 × 16 =
17. 17.18 × 15 =
18. 18.30 × 24 =
19. 19.18 × 24 =
20. 20.43 × 14 =
21. 21.26 × 15 =
22. 22.16 × 14 =
23. 23.38 × 24 =
24. 24.15 × 12 =
25. 25.48 × 24 =
26. 26.21 × 12 =
27. 27.19 × 14 =
28. 28.37 × 16 =
29. 29.12 × 24 =
30. 30.19 × 12 =
31. 31.33 × 18 =
32. 32.27 × 16 =
33. 33.39 × 14 =
34. 34.41 × 14 =
35. 35.44 × 18 =
36. 36.21 × 16 =
37. 37.35 × 12 =
38. 38.46 × 16 =
39. 39.37 × 14 =
40. 40.19 × 15 =

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