Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 50 · 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. 1.35 × 18 =
2. 2.33 × 18 =
3. 3.41 × 15 =
4. 4.41 × 24 =
5. 5.11 × 16 =
6. 6.32 × 16 =
7. 7.32 × 12 =
8. 8.40 × 24 =
9. 9.18 × 15 =
10. 10.13 × 15 =
11. 11.34 × 16 =
12. 12.18 × 12 =
13. 13.26 × 24 =
14. 14.43 × 18 =
15. 15.12 × 16 =
16. 16.15 × 12 =
17. 17.28 × 15 =
18. 18.33 × 14 =
19. 19.47 × 18 =
20. 20.28 × 12 =
21. 21.25 × 15 =
22. 22.37 × 16 =
23. 23.27 × 15 =
24. 24.29 × 18 =
25. 25.31 × 14 =
26. 26.18 × 16 =
27. 27.12 × 14 =
28. 28.18 × 18 =
29. 29.17 × 15 =
30. 30.46 × 15 =
31. 31.23 × 16 =
32. 32.45 × 15 =
33. 33.29 × 16 =
34. 34.44 × 14 =
35. 35.46 × 14 =
36. 36.41 × 14 =
37. 37.40 × 16 =
38. 38.12 × 24 =
39. 39.30 × 16 =
40. 40.47 × 14 =

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