Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 564 · 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 × 24 =
2. 2.15 × 15 =
3. 3.34 × 14 =
4. 4.47 × 16 =
5. 5.47 × 15 =
6. 6.47 × 24 =
7. 7.29 × 18 =
8. 8.30 × 16 =
9. 9.21 × 18 =
10. 10.24 × 14 =
11. 11.28 × 14 =
12. 12.42 × 24 =
13. 13.28 × 15 =
14. 14.18 × 14 =
15. 15.14 × 16 =
16. 16.12 × 12 =
17. 17.44 × 15 =
18. 18.36 × 16 =
19. 19.22 × 14 =
20. 20.23 × 12 =
21. 21.23 × 24 =
22. 22.26 × 12 =
23. 23.30 × 14 =
24. 24.19 × 15 =
25. 25.43 × 12 =
26. 26.40 × 14 =
27. 27.49 × 14 =
28. 28.17 × 18 =
29. 29.29 × 16 =
30. 30.49 × 24 =
31. 31.47 × 18 =
32. 32.49 × 16 =
33. 33.46 × 24 =
34. 34.34 × 12 =
35. 35.12 × 16 =
36. 36.31 × 24 =
37. 37.31 × 15 =
38. 38.26 × 16 =
39. 39.29 × 12 =
40. 40.35 × 15 =

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