Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 327 · 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. 1.30 × 24 =
2. 2.20 × 24 =
3. 3.15 × 16 =
4. 4.43 × 12 =
5. 5.34 × 12 =
6. 6.11 × 16 =
7. 7.48 × 24 =
8. 8.16 × 24 =
9. 9.17 × 14 =
10. 10.12 × 12 =
11. 11.39 × 12 =
12. 12.37 × 16 =
13. 13.29 × 16 =
14. 14.27 × 12 =
15. 15.33 × 15 =
16. 16.30 × 12 =
17. 17.29 × 14 =
18. 18.49 × 15 =
19. 19.31 × 12 =
20. 20.46 × 18 =
21. 21.11 × 12 =
22. 22.34 × 16 =
23. 23.45 × 16 =
24. 24.23 × 24 =
25. 25.17 × 15 =
26. 26.17 × 12 =
27. 27.15 × 18 =
28. 28.23 × 14 =
29. 29.39 × 18 =
30. 30.23 × 12 =
31. 31.19 × 16 =
32. 32.21 × 16 =
33. 33.46 × 16 =
34. 34.26 × 16 =
35. 35.26 × 12 =
36. 36.26 × 14 =
37. 37.46 × 12 =
38. 38.44 × 15 =
39. 39.38 × 18 =
40. 40.16 × 15 =

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