Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 217 · 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. 1.13 × 18 =
2. 2.46 × 12 =
3. 3.17 × 15 =
4. 4.12 × 18 =
5. 5.37 × 15 =
6. 6.16 × 12 =
7. 7.38 × 15 =
8. 8.20 × 14 =
9. 9.40 × 24 =
10. 10.16 × 18 =
11. 11.22 × 24 =
12. 12.26 × 14 =
13. 13.36 × 14 =
14. 14.17 × 12 =
15. 15.39 × 14 =
16. 16.42 × 14 =
17. 17.45 × 24 =
18. 18.45 × 16 =
19. 19.20 × 12 =
20. 20.44 × 18 =
21. 21.27 × 16 =
22. 22.34 × 15 =
23. 23.41 × 15 =
24. 24.12 × 16 =
25. 25.17 × 24 =
26. 26.24 × 16 =
27. 27.11 × 16 =
28. 28.41 × 18 =
29. 29.18 × 15 =
30. 30.29 × 14 =
31. 31.17 × 16 =
32. 32.27 × 15 =
33. 33.44 × 24 =
34. 34.45 × 14 =
35. 35.26 × 16 =
36. 36.38 × 16 =
37. 37.48 × 12 =
38. 38.25 × 14 =
39. 39.14 × 12 =
40. 40.11 × 15 =

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