Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 178 · 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. 1.43 × 16 =
2. 2.40 × 14 =
3. 3.18 × 16 =
4. 4.32 × 18 =
5. 5.14 × 12 =
6. 6.24 × 18 =
7. 7.45 × 15 =
8. 8.17 × 24 =
9. 9.45 × 18 =
10. 10.37 × 14 =
11. 11.33 × 12 =
12. 12.41 × 24 =
13. 13.31 × 18 =
14. 14.20 × 18 =
15. 15.13 × 15 =
16. 16.33 × 14 =
17. 17.31 × 12 =
18. 18.27 × 16 =
19. 19.48 × 16 =
20. 20.39 × 16 =
21. 21.17 × 16 =
22. 22.46 × 18 =
23. 23.21 × 15 =
24. 24.31 × 16 =
25. 25.14 × 16 =
26. 26.24 × 15 =
27. 27.23 × 15 =
28. 28.37 × 24 =
29. 29.28 × 18 =
30. 30.42 × 14 =
31. 31.12 × 24 =
32. 32.15 × 15 =
33. 33.39 × 12 =
34. 34.19 × 24 =
35. 35.36 × 18 =
36. 36.34 × 12 =
37. 37.38 × 12 =
38. 38.43 × 24 =
39. 39.11 × 24 =
40. 40.42 × 15 =

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