Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 144 · 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. 1.33 × 15 =
2. 2.18 × 18 =
3. 3.41 × 14 =
4. 4.19 × 16 =
5. 5.28 × 24 =
6. 6.38 × 24 =
7. 7.30 × 12 =
8. 8.11 × 24 =
9. 9.11 × 16 =
10. 10.22 × 15 =
11. 11.45 × 16 =
12. 12.43 × 14 =
13. 13.17 × 24 =
14. 14.28 × 18 =
15. 15.33 × 24 =
16. 16.16 × 18 =
17. 17.48 × 15 =
18. 18.24 × 12 =
19. 19.27 × 12 =
20. 20.12 × 15 =
21. 21.13 × 14 =
22. 22.27 × 24 =
23. 23.26 × 14 =
24. 24.31 × 24 =
25. 25.35 × 12 =
26. 26.36 × 14 =
27. 27.44 × 12 =
28. 28.29 × 14 =
29. 29.32 × 18 =
30. 30.16 × 24 =
31. 31.27 × 14 =
32. 32.45 × 12 =
33. 33.40 × 12 =
34. 34.11 × 15 =
35. 35.35 × 24 =
36. 36.17 × 15 =
37. 37.29 × 12 =
38. 38.32 × 24 =
39. 39.17 × 18 =
40. 40.19 × 12 =

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