Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 72 · 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. 1.34 × 12 =
2. 2.25 × 18 =
3. 3.11 × 18 =
4. 4.38 × 12 =
5. 5.12 × 14 =
6. 6.43 × 14 =
7. 7.31 × 15 =
8. 8.20 × 14 =
9. 9.32 × 16 =
10. 10.22 × 24 =
11. 11.33 × 24 =
12. 12.47 × 15 =
13. 13.48 × 18 =
14. 14.22 × 14 =
15. 15.46 × 12 =
16. 16.25 × 12 =
17. 17.27 × 15 =
18. 18.34 × 18 =
19. 19.40 × 18 =
20. 20.47 × 12 =
21. 21.45 × 18 =
22. 22.43 × 16 =
23. 23.25 × 24 =
24. 24.40 × 15 =
25. 25.47 × 16 =
26. 26.19 × 18 =
27. 27.21 × 18 =
28. 28.16 × 15 =
29. 29.14 × 15 =
30. 30.34 × 14 =
31. 31.18 × 12 =
32. 32.40 × 24 =
33. 33.44 × 14 =
34. 34.30 × 14 =
35. 35.40 × 12 =
36. 36.37 × 18 =
37. 37.36 × 24 =
38. 38.41 × 12 =
39. 39.46 × 24 =
40. 40.31 × 12 =

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