Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 778 · 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. 1.48 × 15 =
2. 2.33 × 16 =
3. 3.18 × 12 =
4. 4.38 × 15 =
5. 5.25 × 16 =
6. 6.40 × 12 =
7. 7.34 × 14 =
8. 8.11 × 14 =
9. 9.32 × 12 =
10. 10.34 × 18 =
11. 11.26 × 12 =
12. 12.48 × 14 =
13. 13.31 × 24 =
14. 14.42 × 14 =
15. 15.37 × 16 =
16. 16.30 × 14 =
17. 17.29 × 15 =
18. 18.29 × 18 =
19. 19.17 × 24 =
20. 20.35 × 15 =
21. 21.24 × 16 =
22. 22.43 × 15 =
23. 23.27 × 15 =
24. 24.32 × 16 =
25. 25.43 × 14 =
26. 26.14 × 16 =
27. 27.48 × 16 =
28. 28.17 × 14 =
29. 29.28 × 24 =
30. 30.22 × 18 =
31. 31.18 × 16 =
32. 32.14 × 24 =
33. 33.24 × 12 =
34. 34.41 × 18 =
35. 35.12 × 12 =
36. 36.37 × 12 =
37. 37.20 × 24 =
38. 38.40 × 24 =
39. 39.28 × 15 =
40. 40.45 × 12 =

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