standard_description: Rewrite simple rational expressions in different forms; write a(x)/b(x) in the form q(x) + r(x)/b(x), where a(x), b(x), q(x), and r(x) are polynomials with the degree of r(x) less than the degree of b(x), using inspection, long division, or, for the more complicated examples, a computer algebra system.
problem_activity: Task
There were 7 children at the park. Then 4 more showed up. How many children were at the park all together?
There were 7 children at the park. Some more showed up. Then there were 11 children in all. How many more children came?
There were some children at the park. Four more children showed up. Then there were 11 children at the park. How many children were at the park to start with?


aligns: no