Adding and Subtracting Mixed Numbers

$$2\ \frac{3}{5}\ +1\ \frac{3}{10}=$$  

$$3\ \frac{7}{8}\ -1\ \frac{1}{2}$$  

Jenna competes in the high jump. Her best jump in the first meet is  $$4\ \frac{1}{4}$$   feet. Her best jump in the second meet is  $$4\ \frac{5}{6}$$   feet.

Enter an expression, using equivalent fractions with a common denominator, to model how much the height of her jump increased. 

Richie estimates $$1\ \frac{7}{8}-\ 1\ \frac{1}{6}$$ to be about 1, but he finds the actual difference to be less than 1.

Did he make a mistake? 

$$3\ \frac{5}{6}\ -\ 1\ \frac{2}{12}\ =$$  

Shaia buys a bag of apples that weighs $$2\ \frac{7}{16}$$   pounds and another bag that $$2\ \frac{1}{2}$$ weighs pounds.

Estimate the weight of both bags of apples. Then find the exact weight. Please type both your estimate and your exact answer in the space below.  

A restaurant's refrigerator contains $$4\ \frac{1}{2}$$  heads of lettuce. Marlon uses $$3\ \frac{1}{4}$$   of them to make a salad.

How many heads of lettuce are left in the refrigerator?

$$2\ \frac{4}{9}\ +\ 1\ \frac{1}{4}$$