Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 137 · 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. 1.19 × 16 =
2. 2.34 × 24 =
3. 3.23 × 16 =
4. 4.15 × 12 =
5. 5.14 × 18 =
6. 6.48 × 14 =
7. 7.28 × 12 =
8. 8.11 × 24 =
9. 9.15 × 15 =
10. 10.38 × 24 =
11. 11.26 × 16 =
12. 12.33 × 12 =
13. 13.14 × 24 =
14. 14.17 × 15 =
15. 15.47 × 12 =
16. 16.27 × 14 =
17. 17.17 × 24 =
18. 18.21 × 24 =
19. 19.27 × 12 =
20. 20.31 × 15 =
21. 21.40 × 24 =
22. 22.48 × 12 =
23. 23.32 × 16 =
24. 24.44 × 24 =
25. 25.34 × 18 =
26. 26.19 × 15 =
27. 27.21 × 14 =
28. 28.47 × 15 =
29. 29.41 × 18 =
30. 30.23 × 12 =
31. 31.13 × 18 =
32. 32.37 × 14 =
33. 33.48 × 16 =
34. 34.31 × 24 =
35. 35.34 × 12 =
36. 36.40 × 15 =
37. 37.36 × 14 =
38. 38.34 × 14 =
39. 39.13 × 24 =
40. 40.29 × 16 =

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