Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 4 · 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. 2.31 × 15 =
3. 3.29 × 18 =
4. 4.11 × 16 =
5. 5.38 × 12 =
6. 6.25 × 12 =
7. 7.43 × 14 =
8. 8.42 × 15 =
9. 9.19 × 18 =
10. 10.29 × 24 =
11. 11.31 × 16 =
12. 12.23 × 24 =
13. 13.49 × 18 =
14. 14.23 × 18 =
15. 15.37 × 14 =
16. 16.35 × 12 =
17. 17.38 × 16 =
18. 18.27 × 12 =
19. 19.18 × 16 =
20. 20.17 × 12 =
21. 21.30 × 16 =
22. 22.14 × 14 =
23. 23.23 × 15 =
24. 24.36 × 24 =
25. 25.18 × 24 =
26. 26.39 × 16 =
27. 27.11 × 12 =
28. 28.20 × 15 =
29. 29.19 × 15 =
30. 30.29 × 15 =
31. 31.11 × 14 =
32. 32.25 × 14 =
33. 33.34 × 24 =
34. 34.28 × 24 =
35. 35.15 × 18 =
36. 36.12 × 24 =
37. 37.41 × 15 =
38. 38.18 × 14 =
39. 39.18 × 18 =
40. 40.27 × 24 =

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