Response:
2/9 = 0.22
Clarification:
There are two ways to select the first number that is odd and less than 5: 1 and 3.
For each of these, the second number drawn can be any of the values from 1 to 9, giving us a total of 18 options.
Out of these, the only pairs that result in a sum less than 5 are (1,1), (1,2), (1,3), and (3,1). Thus we have 4 combinations from the total of 18:
4/18 = 2/9 = 0.22
we understand that
A fast method for estimating the total of two numbers involves rounding each number and adding the rounded results.
case a) We round to the nearest hundred
so
Round up equals 
Round up equals 
Calculate the estimated sum

case b) We round to the nearest ten
so
Round up equals 
Round down equals 
Calculate the estimated sum

X = 2
4x + 8 = 16
-8 -8
----------------
4x= 8
-- --
4 4
------------
x=2