Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 75 · 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 × 24 =
2. 2.33 × 12 =
3. 3.34 × 18 =
4. 4.35 × 16 =
5. 5.37 × 15 =
6. 6.16 × 18 =
7. 7.14 × 14 =
8. 8.48 × 14 =
9. 9.11 × 16 =
10. 10.29 × 15 =
11. 11.30 × 14 =
12. 12.13 × 18 =
13. 13.13 × 24 =
14. 14.45 × 16 =
15. 15.20 × 24 =
16. 16.40 × 15 =
17. 17.15 × 16 =
18. 18.21 × 12 =
19. 19.46 × 24 =
20. 20.17 × 15 =
21. 21.37 × 16 =
22. 22.30 × 18 =
23. 23.33 × 14 =
24. 24.22 × 12 =
25. 25.43 × 16 =
26. 26.42 × 15 =
27. 27.43 × 15 =
28. 28.41 × 24 =
29. 29.17 × 24 =
30. 30.44 × 12 =
31. 31.34 × 12 =
32. 32.31 × 18 =
33. 33.22 × 14 =
34. 34.27 × 18 =
35. 35.16 × 12 =
36. 36.29 × 16 =
37. 37.21 × 18 =
38. 38.48 × 16 =
39. 39.39 × 12 =
40. 40.35 × 12 =

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