Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 107 · 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. 1.18 × 18 =
2. 2.47 × 15 =
3. 3.29 × 12 =
4. 4.24 × 12 =
5. 5.18 × 24 =
6. 6.30 × 24 =
7. 7.43 × 12 =
8. 8.23 × 18 =
9. 9.43 × 24 =
10. 10.11 × 14 =
11. 11.17 × 15 =
12. 12.12 × 16 =
13. 13.37 × 15 =
14. 14.30 × 14 =
15. 15.25 × 15 =
16. 16.22 × 14 =
17. 17.47 × 18 =
18. 18.32 × 12 =
19. 19.20 × 14 =
20. 20.13 × 16 =
21. 21.21 × 12 =
22. 22.20 × 16 =
23. 23.30 × 16 =
24. 24.33 × 14 =
25. 25.22 × 18 =
26. 26.27 × 24 =
27. 27.17 × 18 =
28. 28.15 × 14 =
29. 29.31 × 16 =
30. 30.21 × 14 =
31. 31.36 × 12 =
32. 32.15 × 15 =
33. 33.29 × 24 =
34. 34.27 × 15 =
35. 35.45 × 12 =
36. 36.33 × 18 =
37. 37.34 × 24 =
38. 38.42 × 24 =
39. 39.14 × 24 =
40. 40.15 × 16 =

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