Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 145 · 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. 1.44 × 16 =
2. 2.18 × 18 =
3. 3.49 × 12 =
4. 4.39 × 15 =
5. 5.49 × 15 =
6. 6.20 × 12 =
7. 7.33 × 15 =
8. 8.38 × 14 =
9. 9.38 × 15 =
10. 10.24 × 16 =
11. 11.30 × 12 =
12. 12.21 × 16 =
13. 13.32 × 12 =
14. 14.29 × 18 =
15. 15.45 × 12 =
16. 16.48 × 15 =
17. 17.30 × 18 =
18. 18.40 × 12 =
19. 19.33 × 12 =
20. 20.25 × 24 =
21. 21.19 × 16 =
22. 22.26 × 24 =
23. 23.43 × 18 =
24. 24.31 × 16 =
25. 25.15 × 14 =
26. 26.40 × 24 =
27. 27.23 × 18 =
28. 28.20 × 18 =
29. 29.34 × 12 =
30. 30.48 × 14 =
31. 31.27 × 24 =
32. 32.42 × 12 =
33. 33.20 × 14 =
34. 34.13 × 14 =
35. 35.32 × 16 =
36. 36.41 × 24 =
37. 37.47 × 14 =
38. 38.43 × 14 =
39. 39.25 × 14 =
40. 40.41 × 16 =

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