Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 452 · 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. 1.18 × 18 =
2. 2.14 × 16 =
3. 3.40 × 12 =
4. 4.30 × 14 =
5. 5.38 × 12 =
6. 6.27 × 24 =
7. 7.21 × 16 =
8. 8.31 × 24 =
9. 9.24 × 14 =
10. 10.34 × 14 =
11. 11.49 × 12 =
12. 12.20 × 18 =
13. 13.20 × 14 =
14. 14.29 × 16 =
15. 15.22 × 12 =
16. 16.31 × 18 =
17. 17.13 × 24 =
18. 18.22 × 14 =
19. 19.23 × 15 =
20. 20.17 × 12 =
21. 21.27 × 15 =
22. 22.41 × 12 =
23. 23.12 × 24 =
24. 24.20 × 16 =
25. 25.49 × 14 =
26. 26.43 × 18 =
27. 27.26 × 15 =
28. 28.41 × 14 =
29. 29.29 × 12 =
30. 30.25 × 15 =
31. 31.17 × 14 =
32. 32.17 × 15 =
33. 33.33 × 18 =
34. 34.45 × 14 =
35. 35.25 × 12 =
36. 36.15 × 14 =
37. 37.49 × 16 =
38. 38.41 × 18 =
39. 39.31 × 14 =
40. 40.20 × 24 =

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