100
520
520 caue x4 500 is 100 and take away 20 and 4x100=520
All multiples of 520, which is an infinite number.
40. There are 400 numbers between 100 and 500 and one in every ten ends in 5.
520
It is 520
520
To the nearest hundred, 520 rounds down to 500.
500
500
500
100
All multiples of 520, which is an infinite number.
520
It is already rounded to the nearest ten as 520
520