Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 106 · 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. 1.24 × 15 =
2. 2.39 × 12 =
3. 3.32 × 12 =
4. 4.34 × 12 =
5. 5.18 × 12 =
6. 6.42 × 15 =
7. 7.48 × 18 =
8. 8.18 × 15 =
9. 9.21 × 16 =
10. 10.46 × 14 =
11. 11.33 × 18 =
12. 12.21 × 24 =
13. 13.45 × 12 =
14. 14.40 × 16 =
15. 15.17 × 14 =
16. 16.38 × 16 =
17. 17.26 × 14 =
18. 18.37 × 14 =
19. 19.49 × 24 =
20. 20.48 × 16 =
21. 21.49 × 12 =
22. 22.17 × 16 =
23. 23.40 × 12 =
24. 24.13 × 18 =
25. 25.11 × 12 =
26. 26.15 × 14 =
27. 27.45 × 15 =
28. 28.14 × 16 =
29. 29.30 × 12 =
30. 30.44 × 12 =
31. 31.41 × 24 =
32. 32.23 × 18 =
33. 33.19 × 24 =
34. 34.33 × 12 =
35. 35.35 × 24 =
36. 36.46 × 18 =
37. 37.16 × 12 =
38. 38.14 × 24 =
39. 39.27 × 14 =
40. 40.19 × 12 =

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