Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 199 · 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. 1.27 × 14 =
2. 2.41 × 12 =
3. 3.17 × 16 =
4. 4.34 × 14 =
5. 5.18 × 16 =
6. 6.18 × 12 =
7. 7.38 × 24 =
8. 8.28 × 12 =
9. 9.29 × 14 =
10. 10.42 × 16 =
11. 11.27 × 18 =
12. 12.34 × 16 =
13. 13.48 × 12 =
14. 14.12 × 16 =
15. 15.39 × 14 =
16. 16.19 × 12 =
17. 17.36 × 12 =
18. 18.27 × 15 =
19. 19.11 × 15 =
20. 20.27 × 16 =
21. 21.38 × 16 =
22. 22.25 × 14 =
23. 23.14 × 14 =
24. 24.38 × 15 =
25. 25.37 × 16 =
26. 26.15 × 18 =
27. 27.30 × 18 =
28. 28.12 × 24 =
29. 29.44 × 14 =
30. 30.13 × 16 =
31. 31.27 × 12 =
32. 32.12 × 14 =
33. 33.34 × 15 =
34. 34.35 × 15 =
35. 35.48 × 14 =
36. 36.33 × 24 =
37. 37.30 × 24 =
38. 38.42 × 15 =
39. 39.47 × 16 =
40. 40.19 × 16 =

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