Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 257 · 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. 1.38 × 24 =
2. 2.34 × 15 =
3. 3.30 × 15 =
4. 4.30 × 18 =
5. 5.21 × 12 =
6. 6.38 × 15 =
7. 7.16 × 24 =
8. 8.12 × 16 =
9. 9.17 × 12 =
10. 10.45 × 16 =
11. 11.36 × 24 =
12. 12.37 × 24 =
13. 13.12 × 18 =
14. 14.16 × 14 =
15. 15.25 × 12 =
16. 16.13 × 12 =
17. 17.18 × 14 =
18. 18.49 × 14 =
19. 19.17 × 15 =
20. 20.33 × 16 =
21. 21.21 × 16 =
22. 22.41 × 18 =
23. 23.24 × 18 =
24. 24.46 × 16 =
25. 25.17 × 14 =
26. 26.11 × 24 =
27. 27.36 × 12 =
28. 28.23 × 24 =
29. 29.31 × 24 =
30. 30.46 × 18 =
31. 31.48 × 16 =
32. 32.21 × 15 =
33. 33.42 × 16 =
34. 34.26 × 14 =
35. 35.41 × 14 =
36. 36.34 × 12 =
37. 37.18 × 12 =
38. 38.24 × 16 =
39. 39.47 × 16 =
40. 40.40 × 12 =

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