Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 553 · 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 × 14 =
2. 2.22 × 12 =
3. 3.34 × 15 =
4. 4.48 × 15 =
5. 5.43 × 16 =
6. 6.28 × 18 =
7. 7.12 × 15 =
8. 8.35 × 15 =
9. 9.42 × 15 =
10. 10.43 × 24 =
11. 11.42 × 14 =
12. 12.18 × 15 =
13. 13.24 × 12 =
14. 14.45 × 15 =
15. 15.33 × 12 =
16. 16.33 × 15 =
17. 17.30 × 12 =
18. 18.29 × 14 =
19. 19.17 × 14 =
20. 20.26 × 24 =
21. 21.14 × 24 =
22. 22.11 × 15 =
23. 23.30 × 24 =
24. 24.47 × 14 =
25. 25.26 × 16 =
26. 26.46 × 18 =
27. 27.27 × 12 =
28. 28.16 × 15 =
29. 29.15 × 15 =
30. 30.30 × 14 =
31. 31.22 × 16 =
32. 32.46 × 24 =
33. 33.44 × 16 =
34. 34.40 × 24 =
35. 35.23 × 12 =
36. 36.36 × 24 =
37. 37.40 × 12 =
38. 38.40 × 16 =
39. 39.14 × 18 =
40. 40.43 × 14 =

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