Estimate then

in simplest form 1/3+1/9=

4/9

Step-by-step explanation:

You firstly turn (1/3) into a fraction with a denominator of 9

; (1/3 * 3/3) = 3/9

Hence you substitute it ..., in place of (1/3)

; 3/9 + 1/9 ... just add the numerators since the bases are equal

; 4/9