Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 230 · 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. 1.19 × 12 =
2. 2.31 × 15 =
3. 3.38 × 12 =
4. 4.35 × 14 =
5. 5.32 × 24 =
6. 6.13 × 14 =
7. 7.21 × 24 =
8. 8.25 × 24 =
9. 9.15 × 12 =
10. 10.11 × 14 =
11. 11.20 × 12 =
12. 12.29 × 24 =
13. 13.19 × 16 =
14. 14.40 × 12 =
15. 15.17 × 12 =
16. 16.26 × 12 =
17. 17.48 × 15 =
18. 18.47 × 18 =
19. 19.33 × 15 =
20. 20.34 × 12 =
21. 21.40 × 18 =
22. 22.43 × 15 =
23. 23.22 × 16 =
24. 24.19 × 15 =
25. 25.34 × 15 =
26. 26.37 × 16 =
27. 27.46 × 24 =
28. 28.40 × 15 =
29. 29.30 × 24 =
30. 30.43 × 24 =
31. 31.45 × 16 =
32. 32.13 × 15 =
33. 33.11 × 16 =
34. 34.16 × 18 =
35. 35.46 × 18 =
36. 36.41 × 24 =
37. 37.15 × 16 =
38. 38.25 × 12 =
39. 39.28 × 14 =
40. 40.39 × 14 =

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