Math Practice grade 8

1. What is a perfect square?




an answer when a number is multiplied by itself.

12 x 12 = 144 so 144 is a perfect square.

- calculator - hit the square root, if a decimal not a perfect square.



2. square root - 351 is between which 2 numbers?

18.73 18 and 19



3. Ratio - 12:16 what is it in lowest terms? (divide 4 ) 3:4



4. 8 students are in band. This is 20% of the class, how big is the class?

20% = (divide by 100) 8/? = 20%... 100 / 20 = 5 x 8 = 40 students are in the class.



5. A c.d. player costs $90 and the GST is 6%. How much is the c.d. player in total.

90 x 0.06 = _____ + 90 = total.



6. 3 1/2 pies to share between 5 people. How much pie does each person get?

3 1/2 = 7/2 divided by 5 =



7. Nolan has a $3000 bond that pay
 
7. Nolan has a $3000 bond that pays 7% interest / year. How much money (including interest) will he have after 4 years?


$3000 x 0.07 = _____ + 3000 = ____ (year 1)

(year 1 total) x 0.07 = ________ +3000 (year 2)





8. 4m + 5 k

k if m=3 and k=(-2)


9. Carl has some c.d's and d.v.d's.


He has 15 more dvd's than twice the number of c.d.'s.

He has 50 dvd's

How many c.d's does he have?





4 x 3 + 5 x (-2)