Adding Subtracting Mixed Numbers Unlike Denominators Regrouping

Find Lowest Common Denominator & solve
1   3/7      +       7   5/11 =

Find Lowest Common Denominator & solve
4    1/2    +   14    6/12 =

Find Lowest Common Denominator & solve
1    1/3   +    4    1/4 =

Find Lowest Common Denominator & solve
8     4/5    +    9    1/10  =

What is the sum?

Connor reasons that $$1\ \frac{12}{5}+3\ \frac{7}{5}=4\ \frac{19}{10}$$ Complete the sentences to make true statements. Connor is not correct because he added the ​ (a)   . The correct answer is ​ (b)  

Sarem, Robin, and Braylan are sharing a pizza. Sarem eats 1/4 of the pizza, Robin eats 1/5 of the pizza, and Braylan eats 3/10 of the pizza. What fraction of the pizza is left?

Subtraction:
Find Lowest Common Denominator & solve
8    5/7    -    7    2/3 = 

Word Problem:
Two cats, Fluffy and Oreo, met in the Park. Fluffy's tail is 3   1/3 of a meter long. Oreo's tail is 2   1/4 of a meter long.
How much Longer is Fluffy's tail than Oreo's tail?

Find Lowest Common Denominator & solve
1     5/7  +   14    1/2