Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 151 · 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 × 14 =
2. 2.38 × 15 =
3. 3.20 × 12 =
4. 4.19 × 24 =
5. 5.19 × 16 =
6. 6.16 × 18 =
7. 7.40 × 18 =
8. 8.11 × 24 =
9. 9.14 × 24 =
10. 10.23 × 12 =
11. 11.41 × 16 =
12. 12.12 × 12 =
13. 13.31 × 12 =
14. 14.35 × 12 =
15. 15.22 × 14 =
16. 16.11 × 14 =
17. 17.12 × 16 =
18. 18.38 × 14 =
19. 19.45 × 12 =
20. 20.24 × 18 =
21. 21.21 × 24 =
22. 22.18 × 14 =
23. 23.30 × 14 =
24. 24.45 × 16 =
25. 25.29 × 15 =
26. 26.29 × 24 =
27. 27.15 × 14 =
28. 28.18 × 15 =
29. 29.40 × 14 =
30. 30.25 × 15 =
31. 31.44 × 12 =
32. 32.11 × 16 =
33. 33.23 × 15 =
34. 34.16 × 24 =
35. 35.19 × 15 =
36. 36.12 × 24 =
37. 37.22 × 12 =
38. 38.42 × 24 =
39. 39.37 × 18 =
40. 40.25 × 18 =

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