GRADE 8 MENTAL MATH - 2 |

**Instructions:**

Grab pencil and paper. In a column, list the numbers 1 to 10.

Speak the question out loud, calculate the answer ** in your head**, then write your answer.

Calculators are not allowed. All calculations must be done in your head and not on paper!

**QUESTIONS**

1) A washing machine repair shop charges $25 per hour and a $30 travel charge. How much will a 4-hour repair job cost?

2) If *n* = 7, what is the value of 5*n* + 3?

3) Find an algebraic expression in *x* and *y* to represent the perimeter of this figure.

4) What is the value of *n* if ?

5) Calculate 10% of 240.

6) Find the value of *x* in this proportion:

7) If 5 popsicles cost $1.25, what is the unit rate?

8) If $50 is 25% of the price of new roller blades, how much do they cost?

9) Collect like terms to simplify ......... 4*n* + 7 + 5*n* – 12

10) Find the value of *x* in the equation ......... 5*x* + 20 = 25

**Solutions**

1) $130 | 2) 38 | 3) 3x + 2y |
4) n = – 12 |
5) 24 |

6) x = 4 |
7) 25¢ each | 8) $200 | 9) 9n – 5 |
10) x = 1 |