Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 195 · 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. 1.45 × 14 =
2. 2.15 × 15 =
3. 3.11 × 16 =
4. 4.15 × 24 =
5. 5.36 × 24 =
6. 6.42 × 12 =
7. 7.46 × 24 =
8. 8.25 × 15 =
9. 9.33 × 16 =
10. 10.29 × 16 =
11. 11.17 × 15 =
12. 12.21 × 15 =
13. 13.12 × 16 =
14. 14.37 × 12 =
15. 15.15 × 14 =
16. 16.20 × 14 =
17. 17.20 × 18 =
18. 18.35 × 15 =
19. 19.33 × 12 =
20. 20.41 × 14 =
21. 21.25 × 24 =
22. 22.17 × 16 =
23. 23.18 × 24 =
24. 24.34 × 16 =
25. 25.12 × 14 =
26. 26.43 × 18 =
27. 27.39 × 14 =
28. 28.32 × 18 =
29. 29.28 × 14 =
30. 30.38 × 18 =
31. 31.16 × 15 =
32. 32.47 × 12 =
33. 33.21 × 14 =
34. 34.11 × 15 =
35. 35.38 × 24 =
36. 36.39 × 15 =
37. 37.28 × 18 =
38. 38.35 × 14 =
39. 39.18 × 14 =
40. 40.35 × 18 =

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