Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 79 · 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 × 15 =
2. 2.41 × 15 =
3. 3.42 × 12 =
4. 4.19 × 14 =
5. 5.45 × 16 =
6. 6.42 × 16 =
7. 7.46 × 12 =
8. 8.36 × 15 =
9. 9.43 × 15 =
10. 10.46 × 14 =
11. 11.22 × 18 =
12. 12.34 × 12 =
13. 13.22 × 16 =
14. 14.29 × 16 =
15. 15.15 × 24 =
16. 16.49 × 12 =
17. 17.11 × 18 =
18. 18.20 × 14 =
19. 19.38 × 18 =
20. 20.46 × 24 =
21. 21.30 × 18 =
22. 22.19 × 15 =
23. 23.27 × 15 =
24. 24.23 × 24 =
25. 25.24 × 14 =
26. 26.26 × 14 =
27. 27.13 × 12 =
28. 28.31 × 18 =
29. 29.49 × 18 =
30. 30.44 × 18 =
31. 31.15 × 16 =
32. 32.48 × 24 =
33. 33.26 × 18 =
34. 34.30 × 15 =
35. 35.28 × 14 =
36. 36.39 × 15 =
37. 37.33 × 16 =
38. 38.29 × 18 =
39. 39.48 × 16 =
40. 40.44 × 14 =

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