Question

The sum of the smallest 4-digit number using
only one digit and the greatest 4-digit number
is=​

Answer 1

We know digits are 0,1,2,3,4,5,6,7,8,9.

We want to form smallest four digit number using only one digit.

We know smallest digit is 0.

Think can we form a four digit number using 0 only.

Ok, try to form we get 0000 which is not a four digit number.

Now next smallest digit is 1.

Try to form four digit number using only 1.

We get 1111 which is smallest four digit number using only one digit.

Largest four digit number can be formed using largest digit, say 9.

We get, 9999 is the largest four digit number.

Now we will find sum of smallest four digit number using only one digit and largest four digit number.

i.e. 1111 + 9999 = 11110

Hence sum is 11110.

Answer 2

Answer:

the smallest 4 digit number is 111 the biggest 4 digit number is 999 so the sum is 1111 plus 9999

=11110

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