# 5th math

posted by on .

what is the least common multiple (LCM)for 15 and 45?

There are 16 girls in a class of 36 student. which expression could be used to determine the number of boys (b) in the class?

please! help i think this too hard for 5th grade math. this suppose to be for 10th or college level instead of me..i don't even understnd this problem.

• 5th math - ,

These are not college or high school problems. They are part of the normal 5th grade curricula.

Check this site for LCM instructions.

http://www.mathsisfun.com/least-common-multiple.html

Let x = the number of boys in the class.

36 - 16 = x

• 5th math - ,

I agree with Ms. Sue. These are definitely in a good 5th grade math curriculum. My granddaughter is in 5th grade this year, and she has had this level of work for over a year now.

• 5th math - ,

can you show how to do the median ?

what is the median for the following numbers?

142,83,65,178,14,78.
i think 83 is the answer.

36/16=B THE ANSWER FOR EXPRESSION FOR .36 STUDENTS 36/16=20 BOYS THE ANSWER

• 5th math - ,

http://www.purplemath.com/modules/meanmode.htm
"The median is the middle number. In this example, the numbers are already listed in numerical order, so I don't have to rewrite the list. But there is no "middle" number, because there are an even number of numbers. In this case, the median is the mean (the usual average) of the middle two values: (2 + 4) ÷ 2 = 6 ÷ 2 = 3"

14, 65, 78, 83, 142, 178
So you need to find the average (mean) between 78 and 83. How will you do that?

• 5th math - ,

LCM=3

let x=total students
let y=total girls
let z=total boyz

z=x-y
z=36-16
z=10

• 5th math - ,

Visitors to an art musuem were asked to
name a favorite type of art.Pottery was
named by 9/40 of the visitors, paonting
was named by 2/5, and sculpture was
named by 3/8. What was the favorite type of art of most visitors ?

• 5th math - ,

lcm=45
36-16=boys

By the way i learned this before 5th grade

• 5th math - ,

This seems very easy..