Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 508 · 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 × 18 =
2. 2.39 × 18 =
3. 3.21 × 12 =
4. 4.42 × 15 =
5. 5.23 × 24 =
6. 6.45 × 18 =
7. 7.39 × 16 =
8. 8.31 × 14 =
9. 9.14 × 18 =
10. 10.11 × 18 =
11. 11.21 × 24 =
12. 12.48 × 14 =
13. 13.29 × 18 =
14. 14.45 × 16 =
15. 15.21 × 14 =
16. 16.12 × 16 =
17. 17.47 × 16 =
18. 18.16 × 18 =
19. 19.33 × 16 =
20. 20.17 × 14 =
21. 21.34 × 16 =
22. 22.33 × 15 =
23. 23.20 × 16 =
24. 24.21 × 15 =
25. 25.42 × 14 =
26. 26.45 × 15 =
27. 27.27 × 24 =
28. 28.43 × 12 =
29. 29.32 × 24 =
30. 30.41 × 15 =
31. 31.35 × 12 =
32. 32.37 × 12 =
33. 33.34 × 12 =
34. 34.25 × 18 =
35. 35.11 × 24 =
36. 36.16 × 12 =
37. 37.34 × 14 =
38. 38.11 × 14 =
39. 39.36 × 18 =
40. 40.42 × 24 =

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