Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 541 · 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. 1.12 × 24 =
2. 2.11 × 18 =
3. 3.28 × 15 =
4. 4.30 × 14 =
5. 5.30 × 16 =
6. 6.11 × 12 =
7. 7.33 × 16 =
8. 8.29 × 16 =
9. 9.37 × 12 =
10. 10.35 × 12 =
11. 11.44 × 14 =
12. 12.29 × 15 =
13. 13.11 × 16 =
14. 14.39 × 18 =
15. 15.36 × 18 =
16. 16.41 × 15 =
17. 17.26 × 18 =
18. 18.32 × 14 =
19. 19.45 × 16 =
20. 20.11 × 24 =
21. 21.40 × 16 =
22. 22.40 × 12 =
23. 23.45 × 15 =
24. 24.34 × 24 =
25. 25.31 × 12 =
26. 26.33 × 14 =
27. 27.43 × 24 =
28. 28.43 × 18 =
29. 29.28 × 24 =
30. 30.21 × 12 =
31. 31.19 × 24 =
32. 32.25 × 18 =
33. 33.18 × 24 =
34. 34.27 × 18 =
35. 35.15 × 15 =
36. 36.26 × 15 =
37. 37.27 × 12 =
38. 38.28 × 14 =
39. 39.14 × 15 =
40. 40.45 × 14 =

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