Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 344 · 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. 1.18 × 18 =
2. 2.17 × 12 =
3. 3.17 × 14 =
4. 4.36 × 18 =
5. 5.26 × 12 =
6. 6.23 × 15 =
7. 7.12 × 15 =
8. 8.32 × 12 =
9. 9.34 × 24 =
10. 10.35 × 18 =
11. 11.40 × 16 =
12. 12.29 × 15 =
13. 13.19 × 14 =
14. 14.15 × 16 =
15. 15.29 × 14 =
16. 16.38 × 24 =
17. 17.40 × 12 =
18. 18.31 × 24 =
19. 19.48 × 18 =
20. 20.41 × 12 =
21. 21.38 × 16 =
22. 22.46 × 24 =
23. 23.34 × 15 =
24. 24.25 × 12 =
25. 25.24 × 18 =
26. 26.39 × 14 =
27. 27.47 × 15 =
28. 28.20 × 16 =
29. 29.11 × 12 =
30. 30.41 × 16 =
31. 31.37 × 14 =
32. 32.14 × 16 =
33. 33.17 × 18 =
34. 34.32 × 15 =
35. 35.11 × 24 =
36. 36.18 × 24 =
37. 37.28 × 14 =
38. 38.18 × 15 =
39. 39.28 × 12 =
40. 40.39 × 12 =

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