Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 138 · 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. 1.20 × 15 =
2. 2.46 × 14 =
3. 3.12 × 15 =
4. 4.33 × 15 =
5. 5.37 × 24 =
6. 6.15 × 12 =
7. 7.31 × 18 =
8. 8.19 × 14 =
9. 9.22 × 14 =
10. 10.12 × 14 =
11. 11.23 × 18 =
12. 12.49 × 12 =
13. 13.44 × 16 =
14. 14.27 × 18 =
15. 15.17 × 12 =
16. 16.28 × 24 =
17. 17.22 × 16 =
18. 18.31 × 14 =
19. 19.31 × 12 =
20. 20.43 × 15 =
21. 21.24 × 16 =
22. 22.40 × 18 =
23. 23.23 × 24 =
24. 24.17 × 16 =
25. 25.20 × 24 =
26. 26.29 × 24 =
27. 27.19 × 24 =
28. 28.39 × 16 =
29. 29.49 × 16 =
30. 30.21 × 15 =
31. 31.15 × 15 =
32. 32.14 × 14 =
33. 33.45 × 18 =
34. 34.19 × 12 =
35. 35.14 × 18 =
36. 36.30 × 15 =
37. 37.17 × 18 =
38. 38.38 × 14 =
39. 39.20 × 12 =
40. 40.49 × 14 =

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