Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 516 · 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 × 18 =
2. 2.37 × 16 =
3. 3.45 × 12 =
4. 4.42 × 12 =
5. 5.27 × 12 =
6. 6.30 × 18 =
7. 7.17 × 14 =
8. 8.38 × 18 =
9. 9.22 × 24 =
10. 10.33 × 24 =
11. 11.36 × 12 =
12. 12.31 × 16 =
13. 13.16 × 24 =
14. 14.31 × 18 =
15. 15.34 × 12 =
16. 16.20 × 24 =
17. 17.12 × 18 =
18. 18.14 × 24 =
19. 19.22 × 18 =
20. 20.40 × 12 =
21. 21.42 × 14 =
22. 22.33 × 14 =
23. 23.47 × 15 =
24. 24.26 × 15 =
25. 25.33 × 18 =
26. 26.46 × 15 =
27. 27.32 × 24 =
28. 28.28 × 15 =
29. 29.25 × 24 =
30. 30.34 × 14 =
31. 31.42 × 24 =
32. 32.28 × 24 =
33. 33.43 × 16 =
34. 34.47 × 16 =
35. 35.36 × 18 =
36. 36.48 × 12 =
37. 37.14 × 16 =
38. 38.41 × 14 =
39. 39.37 × 14 =
40. 40.13 × 16 =

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