Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 221 · 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. 1.41 × 12 =
2. 2.33 × 14 =
3. 3.31 × 18 =
4. 4.40 × 15 =
5. 5.34 × 24 =
6. 6.29 × 14 =
7. 7.16 × 12 =
8. 8.25 × 24 =
9. 9.23 × 24 =
10. 10.22 × 18 =
11. 11.19 × 18 =
12. 12.33 × 18 =
13. 13.37 × 15 =
14. 14.11 × 15 =
15. 15.26 × 15 =
16. 16.16 × 24 =
17. 17.31 × 12 =
18. 18.35 × 24 =
19. 19.18 × 12 =
20. 20.22 × 12 =
21. 21.43 × 12 =
22. 22.12 × 14 =
23. 23.25 × 16 =
24. 24.40 × 24 =
25. 25.11 × 12 =
26. 26.48 × 15 =
27. 27.16 × 14 =
28. 28.27 × 14 =
29. 29.28 × 12 =
30. 30.19 × 14 =
31. 31.24 × 12 =
32. 32.40 × 14 =
33. 33.18 × 15 =
34. 34.21 × 15 =
35. 35.15 × 15 =
36. 36.46 × 14 =
37. 37.20 × 16 =
38. 38.35 × 12 =
39. 39.12 × 12 =
40. 40.41 × 16 =

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