Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 54 · 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. 1.24 × 18 =
2. 2.16 × 14 =
3. 3.19 × 12 =
4. 4.26 × 12 =
5. 5.35 × 14 =
6. 6.43 × 14 =
7. 7.11 × 16 =
8. 8.35 × 18 =
9. 9.21 × 15 =
10. 10.34 × 18 =
11. 11.14 × 16 =
12. 12.35 × 15 =
13. 13.38 × 12 =
14. 14.37 × 14 =
15. 15.25 × 18 =
16. 16.45 × 12 =
17. 17.26 × 14 =
18. 18.48 × 18 =
19. 19.41 × 24 =
20. 20.34 × 16 =
21. 21.37 × 12 =
22. 22.15 × 14 =
23. 23.29 × 14 =
24. 24.11 × 12 =
25. 25.24 × 15 =
26. 26.21 × 18 =
27. 27.49 × 12 =
28. 28.46 × 14 =
29. 29.17 × 16 =
30. 30.45 × 14 =
31. 31.40 × 14 =
32. 32.32 × 14 =
33. 33.45 × 15 =
34. 34.46 × 18 =
35. 35.18 × 12 =
36. 36.15 × 24 =
37. 37.20 × 15 =
38. 38.45 × 18 =
39. 39.18 × 18 =
40. 40.20 × 18 =

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