Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 133 · 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. 1.12 × 15 =
2. 2.14 × 14 =
3. 3.33 × 14 =
4. 4.40 × 24 =
5. 5.30 × 12 =
6. 6.26 × 16 =
7. 7.27 × 15 =
8. 8.48 × 18 =
9. 9.28 × 15 =
10. 10.31 × 14 =
11. 11.31 × 24 =
12. 12.35 × 12 =
13. 13.44 × 15 =
14. 14.14 × 18 =
15. 15.15 × 16 =
16. 16.45 × 24 =
17. 17.43 × 15 =
18. 18.11 × 12 =
19. 19.14 × 16 =
20. 20.47 × 14 =
21. 21.16 × 12 =
22. 22.30 × 16 =
23. 23.19 × 16 =
24. 24.21 × 18 =
25. 25.15 × 24 =
26. 26.12 × 14 =
27. 27.26 × 15 =
28. 28.28 × 12 =
29. 29.38 × 16 =
30. 30.12 × 18 =
31. 31.19 × 24 =
32. 32.22 × 24 =
33. 33.41 × 18 =
34. 34.40 × 15 =
35. 35.39 × 18 =
36. 36.18 × 18 =
37. 37.13 × 24 =
38. 38.24 × 16 =
39. 39.21 × 24 =
40. 40.46 × 24 =

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