Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 69 · 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 × 24 =
2. 2.19 × 12 =
3. 3.34 × 15 =
4. 4.32 × 24 =
5. 5.35 × 12 =
6. 6.44 × 16 =
7. 7.31 × 16 =
8. 8.16 × 24 =
9. 9.22 × 14 =
10. 10.22 × 15 =
11. 11.38 × 18 =
12. 12.39 × 14 =
13. 13.14 × 15 =
14. 14.24 × 16 =
15. 15.31 × 12 =
16. 16.39 × 12 =
17. 17.18 × 14 =
18. 18.45 × 24 =
19. 19.29 × 14 =
20. 20.13 × 12 =
21. 21.27 × 24 =
22. 22.13 × 15 =
23. 23.28 × 15 =
24. 24.40 × 12 =
25. 25.35 × 15 =
26. 26.44 × 24 =
27. 27.11 × 12 =
28. 28.46 × 16 =
29. 29.16 × 14 =
30. 30.37 × 14 =
31. 31.46 × 12 =
32. 32.14 × 12 =
33. 33.39 × 15 =
34. 34.46 × 18 =
35. 35.42 × 12 =
36. 36.27 × 18 =
37. 37.31 × 14 =
38. 38.21 × 12 =
39. 39.12 × 15 =
40. 40.36 × 24 =

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