Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 170 · 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. 1.17 × 18 =
2. 2.34 × 12 =
3. 3.45 × 14 =
4. 4.18 × 14 =
5. 5.35 × 16 =
6. 6.27 × 16 =
7. 7.32 × 14 =
8. 8.30 × 24 =
9. 9.29 × 12 =
10. 10.22 × 24 =
11. 11.25 × 14 =
12. 12.43 × 15 =
13. 13.14 × 12 =
14. 14.42 × 12 =
15. 15.21 × 16 =
16. 16.20 × 12 =
17. 17.39 × 15 =
18. 18.24 × 12 =
19. 19.41 × 12 =
20. 20.13 × 15 =
21. 21.12 × 18 =
22. 22.13 × 14 =
23. 23.36 × 12 =
24. 24.36 × 18 =
25. 25.34 × 18 =
26. 26.47 × 15 =
27. 27.24 × 16 =
28. 28.44 × 18 =
29. 29.36 × 15 =
30. 30.34 × 14 =
31. 31.17 × 15 =
32. 32.38 × 15 =
33. 33.30 × 15 =
34. 34.45 × 18 =
35. 35.26 × 12 =
36. 36.20 × 18 =
37. 37.18 × 24 =
38. 38.15 × 18 =
39. 39.19 × 14 =
40. 40.26 × 15 =

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