Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 713 · 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. 1.21 × 24 =
2. 2.15 × 15 =
3. 3.21 × 12 =
4. 4.33 × 15 =
5. 5.21 × 14 =
6. 6.38 × 24 =
7. 7.43 × 12 =
8. 8.39 × 16 =
9. 9.12 × 15 =
10. 10.27 × 12 =
11. 11.22 × 16 =
12. 12.37 × 16 =
13. 13.37 × 14 =
14. 14.48 × 15 =
15. 15.17 × 14 =
16. 16.26 × 14 =
17. 17.42 × 24 =
18. 18.24 × 24 =
19. 19.11 × 18 =
20. 20.33 × 24 =
21. 21.34 × 12 =
22. 22.18 × 16 =
23. 23.13 × 24 =
24. 24.28 × 18 =
25. 25.32 × 16 =
26. 26.27 × 14 =
27. 27.36 × 14 =
28. 28.30 × 12 =
29. 29.18 × 14 =
30. 30.17 × 24 =
31. 31.15 × 16 =
32. 32.33 × 18 =
33. 33.28 × 24 =
34. 34.16 × 16 =
35. 35.46 × 15 =
36. 36.32 × 18 =
37. 37.48 × 24 =
38. 38.22 × 18 =
39. 39.39 × 18 =
40. 40.45 × 15 =

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