Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 438 · 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. 1.33 × 18 =
2. 2.27 × 16 =
3. 3.42 × 14 =
4. 4.36 × 16 =
5. 5.14 × 12 =
6. 6.33 × 16 =
7. 7.22 × 16 =
8. 8.21 × 15 =
9. 9.15 × 18 =
10. 10.34 × 15 =
11. 11.39 × 16 =
12. 12.28 × 24 =
13. 13.14 × 14 =
14. 14.47 × 15 =
15. 15.13 × 24 =
16. 16.35 × 12 =
17. 17.26 × 12 =
18. 18.15 × 15 =
19. 19.16 × 14 =
20. 20.48 × 12 =
21. 21.37 × 24 =
22. 22.42 × 16 =
23. 23.16 × 24 =
24. 24.16 × 16 =
25. 25.21 × 12 =
26. 26.21 × 16 =
27. 27.31 × 24 =
28. 28.25 × 12 =
29. 29.28 × 16 =
30. 30.14 × 15 =
31. 31.27 × 14 =
32. 32.18 × 24 =
33. 33.26 × 14 =
34. 34.23 × 15 =
35. 35.16 × 18 =
36. 36.19 × 15 =
37. 37.18 × 14 =
38. 38.37 × 15 =
39. 39.45 × 24 =
40. 40.43 × 12 =

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