Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 132 · 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. 1.39 × 16 =
2. 2.25 × 24 =
3. 3.39 × 24 =
4. 4.18 × 15 =
5. 5.29 × 12 =
6. 6.27 × 15 =
7. 7.46 × 24 =
8. 8.47 × 24 =
9. 9.29 × 14 =
10. 10.22 × 24 =
11. 11.23 × 15 =
12. 12.38 × 15 =
13. 13.33 × 24 =
14. 14.12 × 24 =
15. 15.31 × 18 =
16. 16.33 × 14 =
17. 17.28 × 12 =
18. 18.41 × 24 =
19. 19.45 × 16 =
20. 20.45 × 14 =
21. 21.21 × 15 =
22. 22.30 × 12 =
23. 23.12 × 18 =
24. 24.33 × 12 =
25. 25.29 × 15 =
26. 26.42 × 14 =
27. 27.20 × 12 =
28. 28.11 × 18 =
29. 29.34 × 12 =
30. 30.44 × 15 =
31. 31.17 × 16 =
32. 32.15 × 16 =
33. 33.37 × 12 =
34. 34.18 × 18 =
35. 35.19 × 16 =
36. 36.17 × 14 =
37. 37.48 × 14 =
38. 38.37 × 15 =
39. 39.16 × 14 =
40. 40.47 × 18 =

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