Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 316 · 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. 1.15 × 14 =
2. 2.21 × 14 =
3. 3.18 × 12 =
4. 4.22 × 12 =
5. 5.48 × 24 =
6. 6.38 × 15 =
7. 7.27 × 12 =
8. 8.23 × 15 =
9. 9.11 × 24 =
10. 10.30 × 24 =
11. 11.42 × 18 =
12. 12.33 × 15 =
13. 13.33 × 24 =
14. 14.18 × 24 =
15. 15.14 × 15 =
16. 16.26 × 24 =
17. 17.16 × 14 =
18. 18.11 × 16 =
19. 19.35 × 15 =
20. 20.21 × 16 =
21. 21.40 × 16 =
22. 22.35 × 14 =
23. 23.47 × 24 =
24. 24.37 × 14 =
25. 25.46 × 18 =
26. 26.23 × 12 =
27. 27.13 × 14 =
28. 28.39 × 12 =
29. 29.19 × 24 =
30. 30.33 × 16 =
31. 31.22 × 15 =
32. 32.38 × 14 =
33. 33.22 × 24 =
34. 34.48 × 14 =
35. 35.37 × 12 =
36. 36.45 × 14 =
37. 37.34 × 12 =
38. 38.19 × 14 =
39. 39.14 × 14 =
40. 40.25 × 24 =

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