Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 973 · 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. 1.31 × 18 =
2. 2.11 × 18 =
3. 3.23 × 15 =
4. 4.45 × 16 =
5. 5.17 × 16 =
6. 6.21 × 12 =
7. 7.45 × 14 =
8. 8.33 × 16 =
9. 9.38 × 14 =
10. 10.24 × 12 =
11. 11.11 × 15 =
12. 12.20 × 24 =
13. 13.12 × 14 =
14. 14.48 × 15 =
15. 15.28 × 18 =
16. 16.15 × 12 =
17. 17.39 × 15 =
18. 18.11 × 12 =
19. 19.33 × 12 =
20. 20.36 × 14 =
21. 21.32 × 14 =
22. 22.14 × 12 =
23. 23.43 × 16 =
24. 24.45 × 15 =
25. 25.35 × 12 =
26. 26.41 × 12 =
27. 27.15 × 18 =
28. 28.46 × 16 =
29. 29.48 × 16 =
30. 30.34 × 14 =
31. 31.22 × 18 =
32. 32.48 × 14 =
33. 33.28 × 14 =
34. 34.12 × 18 =
35. 35.11 × 16 =
36. 36.25 × 24 =
37. 37.40 × 24 =
38. 38.36 × 18 =
39. 39.43 × 24 =
40. 40.16 × 18 =

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