Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 659 · 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. 1.39 × 16 =
2. 2.13 × 24 =
3. 3.43 × 15 =
4. 4.40 × 14 =
5. 5.14 × 16 =
6. 6.49 × 24 =
7. 7.47 × 18 =
8. 8.33 × 24 =
9. 9.31 × 15 =
10. 10.29 × 15 =
11. 11.17 × 14 =
12. 12.20 × 18 =
13. 13.24 × 12 =
14. 14.38 × 14 =
15. 15.36 × 14 =
16. 16.14 × 12 =
17. 17.22 × 18 =
18. 18.28 × 12 =
19. 19.41 × 18 =
20. 20.12 × 18 =
21. 21.43 × 14 =
22. 22.28 × 15 =
23. 23.21 × 18 =
24. 24.17 × 24 =
25. 25.25 × 15 =
26. 26.33 × 14 =
27. 27.13 × 15 =
28. 28.30 × 15 =
29. 29.26 × 15 =
30. 30.46 × 24 =
31. 31.46 × 14 =
32. 32.20 × 24 =
33. 33.18 × 15 =
34. 34.39 × 14 =
35. 35.20 × 15 =
36. 36.41 × 15 =
37. 37.26 × 18 =
38. 38.19 × 18 =
39. 39.43 × 24 =
40. 40.27 × 14 =

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