California High School Exit Examination - Number sense solved Exercises 7-9 - Oct. 2008

From  California High School Exit Examination 2008

  Exercise  7

One hundred is multiplied by a number between 0 and 1. The answer has to be—

A less than 0.
B between 0 and 50 but not 25.
C between 0 and 100 but not 50.
D between 0 and 100.

Solution  7

We multiply one hundred by zero and get 0 -- 100*0 = 0
We multiply one hundred by one and get 100 -- 100*1 =1

So if One hundred is multiplied by a number between 0 and 1. The answer has to be
between 0 and 100.


  Exercise 8
John uses 2/3 of a cup of oats per serving to make oatmeal. How many cups of oats does he need to make 6 servings?

Solution  8

To make 1 serving John uses 2/3 of a cup
To make 6 serving John uses x  cups

We find x by: x =

Solving for x:


The right answer is B. 4


  Exercise 9

Solution 9

 We solve 





The right answer is C. 1/64

California High School Exit Examination - Number sense solved Exercises 4-6 - Oct. 2008

  From  California High School Exit Examination 2008

  Exercise 4

The five members of a band are getting new outfits. Shirts cost $12 each, pants cost $29 each, and boots cost $49 a pair. What is the total cost of the new outfits for all of the members?

A. $90
B. $95
C. $450
D. $500

Solution 4

We calculate the cost of outfits for each member of the band:
$12 shirt + $29 pant +$49 boots = $90 outfits for each member.

There are five members of the band so the total cost is: 5 * $90 = $450.
 The right answer is C. $450



  Exercise 5  - fractions

Solution 5



The right answer is A : 1/3




Exercise 6 -  negative numbers

Which of the following numerical expressions results in a negative number?

A. (–7) + (–3)
B. (–3) + (7)
C. (3) + (7)
D. (3) + (–7) + (11)

Solution 6

Expression A result a negative number: (-7) + (-3) = (-10)