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Problem Solving: Solving Algebraic Expressions

Solve each problem by substituting the values and evaluating each expression.

The area of a rectangle is the product of the length and width.

 1.

  If l=20 and w=15, find A.

 2.

  If l=4 and w=8, find A.

 3.

  If l=5.6 and w=3.5, find A.

 4.

  If l=8.5 and w=9.0, find A.

 5.

  If l=5 and w=3.5, find A.

 6.

  If l=8.2 and w=9.3, find A.

The perimeter of a rectangle is found by multiplying the sum of the length and width by 2.

 7.

  If l=25 and w=19, find P.

 8.

  If l=4 and w=8, find P.

 9.

  If l=4 and w=9, find P.

 10.

  If l=8 and w=2.5, find P.

 11.

  If l=6 and w=3.5, find P.

 12.

  If l=8.5 and w=4.7, find P.

The area of a triangle is found by dividing the product of the length and width by 2.

13.

 If a=25 and b=10, find A.

14.

 If a=4 and b=8, find A.

 15.

 If a=5 and b=8, find A.

 16.

 If a=8 and b=2.5, find A.

 17.

 If a=5 and b=3.2, find A.

 18.

 If a=8.5 and b=4.7, find A.

1. If a=25 and b=10, find A. 2. If a=4 and b=8, find A.

3. If a=5 and b=8, find A. 4. If a=8 and b=2.5, find P.

5. If a=5 and b=3.2, find A. 6. If a=8.5 and b=4.7, find P.

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