Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 214 · 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. 1.27 × 12 =
2. 2.20 × 18 =
3. 3.25 × 12 =
4. 4.34 × 24 =
5. 5.25 × 16 =
6. 6.42 × 24 =
7. 7.42 × 16 =
8. 8.21 × 18 =
9. 9.45 × 12 =
10. 10.32 × 14 =
11. 11.47 × 18 =
12. 12.15 × 14 =
13. 13.44 × 16 =
14. 14.34 × 15 =
15. 15.37 × 15 =
16. 16.29 × 16 =
17. 17.20 × 12 =
18. 18.46 × 14 =
19. 19.18 × 14 =
20. 20.30 × 16 =
21. 21.13 × 16 =
22. 22.21 × 16 =
23. 23.36 × 24 =
24. 24.40 × 24 =
25. 25.33 × 16 =
26. 26.35 × 24 =
27. 27.49 × 14 =
28. 28.45 × 24 =
29. 29.43 × 18 =
30. 30.34 × 18 =
31. 31.23 × 14 =
32. 32.45 × 14 =
33. 33.34 × 12 =
34. 34.41 × 24 =
35. 35.22 × 14 =
36. 36.37 × 12 =
37. 37.35 × 12 =
38. 38.18 × 16 =
39. 39.41 × 16 =
40. 40.40 × 15 =

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