Question

5 tens less than 9 hundreds is

Answer 1

5 tens means 5x10 = 50
and 9 hundreds means 9x100 = 900

5 tens less than 9 hundreds means
            900-50 = 850

Answer 2

10 * 5= 50
100* 9 = 900
less= - (minus)
900 - 50
= 850.