Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 68 · 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. 1.36 × 18 =
2. 2.17 × 18 =
3. 3.47 × 24 =
4. 4.14 × 14 =
5. 5.37 × 14 =
6. 6.23 × 18 =
7. 7.49 × 16 =
8. 8.25 × 18 =
9. 9.43 × 16 =
10. 10.41 × 12 =
11. 11.17 × 12 =
12. 12.19 × 12 =
13. 13.29 × 18 =
14. 14.43 × 14 =
15. 15.29 × 12 =
16. 16.49 × 12 =
17. 17.46 × 16 =
18. 18.21 × 14 =
19. 19.22 × 12 =
20. 20.19 × 24 =
21. 21.22 × 14 =
22. 22.32 × 24 =
23. 23.28 × 24 =
24. 24.34 × 16 =
25. 25.37 × 15 =
26. 26.27 × 12 =
27. 27.30 × 18 =
28. 28.23 × 12 =
29. 29.38 × 16 =
30. 30.13 × 24 =
31. 31.31 × 18 =
32. 32.42 × 14 =
33. 33.17 × 24 =
34. 34.28 × 16 =
35. 35.45 × 16 =
36. 36.43 × 24 =
37. 37.44 × 24 =
38. 38.17 × 14 =
39. 39.20 × 14 =
40. 40.41 × 18 =

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