Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 261 · 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 × 14 =
2. 2.28 × 14 =
3. 3.17 × 12 =
4. 4.20 × 18 =
5. 5.40 × 14 =
6. 6.34 × 15 =
7. 7.40 × 15 =
8. 8.41 × 24 =
9. 9.32 × 12 =
10. 10.27 × 14 =
11. 11.47 × 15 =
12. 12.11 × 14 =
13. 13.37 × 14 =
14. 14.40 × 18 =
15. 15.12 × 18 =
16. 16.23 × 24 =
17. 17.31 × 14 =
18. 18.16 × 24 =
19. 19.21 × 14 =
20. 20.17 × 24 =
21. 21.21 × 18 =
22. 22.34 × 18 =
23. 23.40 × 24 =
24. 24.24 × 14 =
25. 25.44 × 16 =
26. 26.46 × 18 =
27. 27.28 × 24 =
28. 28.45 × 15 =
29. 29.24 × 18 =
30. 30.31 × 24 =
31. 31.48 × 18 =
32. 32.15 × 18 =
33. 33.39 × 24 =
34. 34.13 × 14 =
35. 35.32 × 18 =
36. 36.25 × 12 =
37. 37.45 × 24 =
38. 38.29 × 15 =
39. 39.45 × 18 =
40. 40.19 × 15 =

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