Question

Toby picks a 6-digit number.

It is larger than 599,999 and it is a multiple of 5.
How many different numbers could he have picked?

Answer 1

80,000 numbers.

Explanation:

Since the number is 6-digits and is larger than 599,999, it would be between 600,000 and 999,999.

Between those two numbers (included), there are
`999999 - 600000 = 399999` numbers.

In addition, we know that the number is a multiple of 5. Therefore, we should divide this number by 5 to find how many of the numbers in that group are divisible by 5.
Since it's difficult dividing 399,999 by 5, I would divide 400,000 by 5, as we must also include 600,000.

`\frac{400000}5 = 80000`