Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 73 · 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. 2.14 × 14 =
3. 3.44 × 14 =
4. 4.47 × 16 =
5. 5.12 × 12 =
6. 6.43 × 12 =
7. 7.34 × 15 =
8. 8.33 × 24 =
9. 9.13 × 24 =
10. 10.27 × 24 =
11. 11.38 × 12 =
12. 12.20 × 18 =
13. 13.27 × 14 =
14. 14.43 × 15 =
15. 15.14 × 12 =
16. 16.17 × 14 =
17. 17.34 × 18 =
18. 18.14 × 15 =
19. 19.28 × 12 =
20. 20.14 × 18 =
21. 21.18 × 14 =
22. 22.15 × 14 =
23. 23.42 × 16 =
24. 24.20 × 24 =
25. 25.40 × 16 =
26. 26.47 × 24 =
27. 27.30 × 12 =
28. 28.19 × 12 =
29. 29.30 × 15 =
30. 30.24 × 16 =
31. 31.46 × 24 =
32. 32.19 × 16 =
33. 33.45 × 14 =
34. 34.11 × 15 =
35. 35.32 × 18 =
36. 36.28 × 14 =
37. 37.17 × 15 =
38. 38.48 × 16 =
39. 39.41 × 18 =
40. 40.46 × 16 =

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