Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 140 · 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 × 15 =
2. 2.37 × 12 =
3. 3.21 × 15 =
4. 4.30 × 15 =
5. 5.22 × 16 =
6. 6.37 × 18 =
7. 7.14 × 15 =
8. 8.24 × 12 =
9. 9.33 × 18 =
10. 10.33 × 12 =
11. 11.23 × 12 =
12. 12.26 × 12 =
13. 13.36 × 18 =
14. 14.36 × 24 =
15. 15.43 × 14 =
16. 16.20 × 16 =
17. 17.46 × 18 =
18. 18.41 × 15 =
19. 19.11 × 24 =
20. 20.15 × 12 =
21. 21.23 × 24 =
22. 22.45 × 12 =
23. 23.34 × 15 =
24. 24.41 × 24 =
25. 25.31 × 18 =
26. 26.42 × 12 =
27. 27.19 × 15 =
28. 28.33 × 16 =
29. 29.46 × 14 =
30. 30.20 × 14 =
31. 31.28 × 24 =
32. 32.21 × 16 =
33. 33.40 × 14 =
34. 34.26 × 24 =
35. 35.18 × 16 =
36. 36.14 × 18 =
37. 37.12 × 24 =
38. 38.32 × 18 =
39. 39.22 × 12 =
40. 40.23 × 14 =

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