Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 511 · 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. 1.21 × 24 =
2. 2.47 × 14 =
3. 3.34 × 16 =
4. 4.18 × 16 =
5. 5.37 × 16 =
6. 6.14 × 18 =
7. 7.12 × 24 =
8. 8.37 × 24 =
9. 9.16 × 14 =
10. 10.28 × 12 =
11. 11.13 × 14 =
12. 12.15 × 24 =
13. 13.25 × 24 =
14. 14.45 × 18 =
15. 15.33 × 14 =
16. 16.29 × 12 =
17. 17.13 × 16 =
18. 18.40 × 24 =
19. 19.49 × 12 =
20. 20.36 × 24 =
21. 21.27 × 18 =
22. 22.18 × 15 =
23. 23.45 × 16 =
24. 24.29 × 15 =
25. 25.40 × 18 =
26. 26.16 × 15 =
27. 27.19 × 14 =
28. 28.42 × 15 =
29. 29.28 × 14 =
30. 30.26 × 12 =
31. 31.48 × 16 =
32. 32.46 × 24 =
33. 33.23 × 12 =
34. 34.20 × 15 =
35. 35.34 × 24 =
36. 36.25 × 16 =
37. 37.33 × 15 =
38. 38.40 × 16 =
39. 39.11 × 18 =
40. 40.43 × 18 =

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