Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 202 · 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 × 12 =
2. 2.47 × 12 =
3. 3.21 × 18 =
4. 4.39 × 16 =
5. 5.45 × 24 =
6. 6.36 × 18 =
7. 7.15 × 14 =
8. 8.45 × 12 =
9. 9.15 × 15 =
10. 10.31 × 16 =
11. 11.23 × 16 =
12. 12.27 × 24 =
13. 13.49 × 24 =
14. 14.30 × 12 =
15. 15.17 × 14 =
16. 16.45 × 18 =
17. 17.23 × 18 =
18. 18.34 × 15 =
19. 19.41 × 18 =
20. 20.19 × 12 =
21. 21.29 × 12 =
22. 22.28 × 24 =
23. 23.24 × 18 =
24. 24.38 × 14 =
25. 25.47 × 14 =
26. 26.46 × 16 =
27. 27.13 × 15 =
28. 28.34 × 18 =
29. 29.17 × 24 =
30. 30.43 × 18 =
31. 31.12 × 24 =
32. 32.48 × 14 =
33. 33.34 × 16 =
34. 34.30 × 15 =
35. 35.23 × 12 =
36. 36.23 × 24 =
37. 37.37 × 12 =
38. 38.14 × 18 =
39. 39.23 × 14 =
40. 40.28 × 15 =

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