Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 105 · 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. 1.40 × 16 =
2. 2.41 × 12 =
3. 3.35 × 15 =
4. 4.21 × 24 =
5. 5.42 × 14 =
6. 6.24 × 14 =
7. 7.17 × 16 =
8. 8.47 × 14 =
9. 9.39 × 12 =
10. 10.17 × 14 =
11. 11.12 × 12 =
12. 12.20 × 18 =
13. 13.37 × 14 =
14. 14.16 × 12 =
15. 15.11 × 12 =
16. 16.35 × 14 =
17. 17.40 × 14 =
18. 18.26 × 16 =
19. 19.29 × 14 =
20. 20.28 × 16 =
21. 21.40 × 18 =
22. 22.13 × 15 =
23. 23.47 × 18 =
24. 24.45 × 24 =
25. 25.25 × 15 =
26. 26.27 × 16 =
27. 27.25 × 24 =
28. 28.15 × 12 =
29. 29.19 × 14 =
30. 30.44 × 24 =
31. 31.28 × 18 =
32. 32.28 × 24 =
33. 33.21 × 12 =
34. 34.43 × 15 =
35. 35.27 × 12 =
36. 36.49 × 12 =
37. 37.16 × 15 =
38. 38.24 × 24 =
39. 39.31 × 15 =
40. 40.13 × 12 =

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