Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 128 · 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. 1.49 × 16 =
2. 2.37 × 12 =
3. 3.46 × 16 =
4. 4.45 × 14 =
5. 5.49 × 24 =
6. 6.35 × 12 =
7. 7.40 × 15 =
8. 8.46 × 14 =
9. 9.31 × 12 =
10. 10.39 × 24 =
11. 11.21 × 24 =
12. 12.28 × 14 =
13. 13.27 × 14 =
14. 14.26 × 16 =
15. 15.35 × 14 =
16. 16.27 × 16 =
17. 17.39 × 14 =
18. 18.18 × 14 =
19. 19.12 × 12 =
20. 20.44 × 16 =
21. 21.40 × 16 =
22. 22.49 × 18 =
23. 23.36 × 12 =
24. 24.21 × 18 =
25. 25.29 × 12 =
26. 26.20 × 24 =
27. 27.22 × 16 =
28. 28.11 × 16 =
29. 29.32 × 18 =
30. 30.41 × 16 =
31. 31.17 × 14 =
32. 32.33 × 15 =
33. 33.21 × 15 =
34. 34.40 × 14 =
35. 35.11 × 18 =
36. 36.36 × 15 =
37. 37.26 × 12 =
38. 38.35 × 24 =
39. 39.34 × 15 =
40. 40.29 × 18 =

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