Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 27 · 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. 1.29 × 24 =
2. 2.43 × 14 =
3. 3.21 × 12 =
4. 4.45 × 16 =
5. 5.30 × 15 =
6. 6.17 × 18 =
7. 7.30 × 12 =
8. 8.46 × 16 =
9. 9.28 × 16 =
10. 10.31 × 18 =
11. 11.37 × 24 =
12. 12.42 × 14 =
13. 13.20 × 16 =
14. 14.33 × 16 =
15. 15.41 × 12 =
16. 16.27 × 15 =
17. 17.38 × 15 =
18. 18.15 × 18 =
19. 19.31 × 12 =
20. 20.23 × 12 =
21. 21.13 × 24 =
22. 22.31 × 14 =
23. 23.28 × 15 =
24. 24.26 × 16 =
25. 25.13 × 16 =
26. 26.14 × 24 =
27. 27.16 × 12 =
28. 28.49 × 14 =
29. 29.40 × 12 =
30. 30.13 × 14 =
31. 31.27 × 18 =
32. 32.35 × 16 =
33. 33.20 × 24 =
34. 34.16 × 24 =
35. 35.41 × 16 =
36. 36.29 × 12 =
37. 37.17 × 12 =
38. 38.43 × 16 =
39. 39.33 × 15 =
40. 40.38 × 16 =

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