Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 432 · 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. 1.15 × 16 =
2. 2.20 × 12 =
3. 3.21 × 12 =
4. 4.30 × 12 =
5. 5.40 × 18 =
6. 6.37 × 12 =
7. 7.25 × 14 =
8. 8.25 × 24 =
9. 9.45 × 12 =
10. 10.23 × 24 =
11. 11.11 × 18 =
12. 12.19 × 16 =
13. 13.40 × 12 =
14. 14.18 × 24 =
15. 15.15 × 14 =
16. 16.16 × 16 =
17. 17.31 × 16 =
18. 18.31 × 18 =
19. 19.12 × 12 =
20. 20.26 × 12 =
21. 21.46 × 15 =
22. 22.36 × 24 =
23. 23.44 × 18 =
24. 24.48 × 15 =
25. 25.32 × 24 =
26. 26.18 × 15 =
27. 27.24 × 15 =
28. 28.17 × 14 =
29. 29.40 × 14 =
30. 30.33 × 14 =
31. 31.35 × 15 =
32. 32.21 × 16 =
33. 33.31 × 12 =
34. 34.47 × 18 =
35. 35.24 × 14 =
36. 36.23 × 16 =
37. 37.14 × 16 =
38. 38.16 × 15 =
39. 39.31 × 14 =
40. 40.37 × 24 =

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