Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 252 · 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. 1.13 × 14 =
2. 2.29 × 24 =
3. 3.20 × 12 =
4. 4.16 × 15 =
5. 5.15 × 16 =
6. 6.12 × 15 =
7. 7.11 × 14 =
8. 8.45 × 18 =
9. 9.13 × 16 =
10. 10.17 × 18 =
11. 11.44 × 24 =
12. 12.38 × 12 =
13. 13.18 × 18 =
14. 14.18 × 15 =
15. 15.45 × 15 =
16. 16.39 × 16 =
17. 17.28 × 18 =
18. 18.32 × 24 =
19. 19.42 × 18 =
20. 20.12 × 14 =
21. 21.31 × 14 =
22. 22.40 × 14 =
23. 23.45 × 16 =
24. 24.18 × 12 =
25. 25.48 × 15 =
26. 26.48 × 16 =
27. 27.19 × 16 =
28. 28.42 × 14 =
29. 29.21 × 24 =
30. 30.14 × 14 =
31. 31.27 × 18 =
32. 32.12 × 16 =
33. 33.41 × 14 =
34. 34.28 × 15 =
35. 35.44 × 12 =
36. 36.22 × 12 =
37. 37.43 × 24 =
38. 38.49 × 24 =
39. 39.15 × 12 =
40. 40.14 × 24 =

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