question_answer 1)

Write all the factors of the following numbers (a) 24                     (b) 15                    (c) 21 (d) 27                    (e) 12                    (f) 20 (g) 18                     (h) 23                    (i) 36

Answer:

                (a) We have, 24 \[24=1\times 24;24=2\times 12;24=3\times 8;=4\times 6\] \[\therefore \] Factors of 24 are 1, 2, 3, 4, 6, 8, 12 and 24. (b) We have, 15 15 = 1 \[\times \]15; 15 = 3 \[\times \] 5 \[\therefore \] Factors of 15 are 1, 3, 5 and 15. (c) We have, 21 21 = 1 \[\times \]21; 21 = 3 \[\times \]7 \[\therefore \] Factors of 21 are 1, 3, 7 and 21. (d) We have, 27 27 = 1 \[\times \]27 : 27 = 3 \[\times \] 9 \[\therefore \] Factors of 27 are 1, 3, 9 and 27. (e) We have, 12 12 = 1 \[\times \] 12; 12 = 2 \[\times \] 6; 12 = 3 \[\times \] 4 \[\therefore \] Factors of 12 are 1, 2, 3, 4, 6 and 12. (f) We have, 20 20 = 1 \[\times \] 20; 20 = 2 \[\times \] 10; 20 = 4 \[\times \] 5 \[\therefore \] Factors of 20 are 1, 2, 4, 5, 10 and 20. (g) We have, 18 18 = 1 \[\times \] 18; 18 = 2\[\times \] 9; 18 = 3 \[\times \]6 \[\therefore \]Factors of 18 are 1, 2, 3, 6, 9 and 18. (h) We have, 23 23 = 1 \[\times \] 23 \[\therefore \] Factors of 23 are 1 and 23. (i) We have, 36 36 = 1 \[\times \] 36; 36 = 2 \[\times \] 18; 36 = 3 \[\times \]12; 36 = 4 \[\times \] 9; 36 = 6\[\times \]6 \[\therefore \] Factors of 36 are 1, 2, 3, 4, 6, 9, 12, 18 and 36.