Simplify and Evaluate Expressions Assessment
Name__________________
Simplify the following problems:
1.
5a + 5 + 2a + 4
2.
6 + 2a – 4 + 2a
3.
x+x+x
4.
-7n – 5n
5.
2xy + x + 4xy + y
6.
3x2 + 4x – 5x2
7.
Let x = 3, y = 6 and z = -5. Evaluate 2x + y + z.
8.
Let a = -3,
9.
On a recent quiz a question was, “Simplify 5x + 7x.”
b = -2 and c = -1. Evaluate 3a – b + 2c.
The student response was 12x2.
Explain the error and provide the correct answer.
Improving Student Achievement in Algebra, Grades 7-12. The DuPage1 Mathematics
Network. DuPage Regional Office of Education. May 2007
1
10. On the same quiz, another question was, “Evaluate 5x – y, when x = 2 and y = -7.”
A student answered “3.”
Explain the error and provide the correct answer.
11. Write an expression to represent the perimeter of the rectangle below.
2x – 1
3x + 7
12. There are many correct answers for the variables x, y and z in the following
equation. One possibility is x = 1, y = 2, z = 9. Find two other possibilities.
6x + 2y – z = 1
13. Write an expression for the following.
14. Explain the differences between simplifying an expression and evaluating an
expression.
Improving Student Achievement in Algebra, Grades 7-12. The DuPage1 Mathematics
Network. DuPage Regional Office of Education. May 2007
2