Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 484 · 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. 1.20 × 12 =
2. 2.31 × 14 =
3. 3.23 × 16 =
4. 4.35 × 15 =
5. 5.29 × 24 =
6. 6.14 × 12 =
7. 7.35 × 14 =
8. 8.33 × 14 =
9. 9.18 × 24 =
10. 10.17 × 18 =
11. 11.28 × 15 =
12. 12.21 × 15 =
13. 13.38 × 14 =
14. 14.25 × 16 =
15. 15.29 × 12 =
16. 16.40 × 15 =
17. 17.11 × 14 =
18. 18.28 × 24 =
19. 19.27 × 24 =
20. 20.12 × 14 =
21. 21.26 × 15 =
22. 22.40 × 24 =
23. 23.15 × 12 =
24. 24.38 × 16 =
25. 25.44 × 16 =
26. 26.35 × 12 =
27. 27.12 × 16 =
28. 28.20 × 18 =
29. 29.21 × 14 =
30. 30.28 × 12 =
31. 31.49 × 24 =
32. 32.17 × 15 =
33. 33.20 × 16 =
34. 34.47 × 12 =
35. 35.34 × 12 =
36. 36.40 × 12 =
37. 37.13 × 24 =
38. 38.48 × 14 =
39. 39.28 × 14 =
40. 40.33 × 16 =

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