Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 284 · 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. 1.33 × 16 =
2. 2.34 × 15 =
3. 3.24 × 18 =
4. 4.44 × 24 =
5. 5.15 × 15 =
6. 6.40 × 14 =
7. 7.30 × 15 =
8. 8.12 × 12 =
9. 9.43 × 15 =
10. 10.36 × 16 =
11. 11.39 × 24 =
12. 12.26 × 16 =
13. 13.33 × 18 =
14. 14.17 × 12 =
15. 15.30 × 14 =
16. 16.21 × 24 =
17. 17.19 × 12 =
18. 18.15 × 24 =
19. 19.47 × 14 =
20. 20.27 × 18 =
21. 21.46 × 12 =
22. 22.17 × 14 =
23. 23.29 × 15 =
24. 24.34 × 16 =
25. 25.42 × 24 =
26. 26.28 × 12 =
27. 27.48 × 18 =
28. 28.34 × 12 =
29. 29.25 × 12 =
30. 30.31 × 12 =
31. 31.36 × 12 =
32. 32.13 × 12 =
33. 33.47 × 12 =
34. 34.26 × 15 =
35. 35.17 × 24 =
36. 36.29 × 12 =
37. 37.13 × 16 =
38. 38.35 × 14 =
39. 39.16 × 12 =
40. 40.14 × 16 =

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