Question

1. What is the average of the smallest and the greatest three-digit numbers that are
divisible by 18?
(1) 545 (2) 645 (3) 549 (4) 649​

Answer 1

Answer:

549 (3)

Step-by-step explanation:

smallest 3 digit number that is divisible by 18 is 108,greatest 3 digit number that is divisible by 8 is 990

average = 108+990/2

average = 549

Answer 2

Answer:

when 100 is divided by 18, remainder is 10. It means that adding more 8 into 100 will give us the smallest number. (Substracting 10 from 100 wont do the job, since 100-10=90 which is not a 3 digit number).

smallest= 18×6= 108 .

.

when 999 is divided by 18, remainder is 9. it means substracting 9 from 990 wil give us the greatest number.

greatest= 990

.

average= (108+990)/2 = 549.