Posted by Will on .
A store clerk wants to stack 55 cans of tennis balls in a triangular display. How many cans would be in the bottom row?

4th grade math 
Anonymous,
answer is 10...i used guess and check ...!

4th grade math 
Will,
We also got ten, but we trying to explain it to a 9 year old for her schoolwork. That is where we are stuck.

4th grade math 
Anonymous,
i need help on fact families 6 and 5 pleaseeeeee answer me

4th grade math 
Ronnie,
Estimating Products Example 7multiply42 is close to 7 multiply ?

4th grade math 
Reiny,
Math is the study of patterns.
My first column is the sum of cans after so many rows,
the second column in the increase in the number of cans
Think of racking up billiard balls
.......О
.....О О
....О О О
...О О О О
..О О О О О
.О О О О О О
О О О О О О О
О О О О О О О О
1
2
3
3
6
4
10
5
15
6
21
etc, do you see the pattern? 
4th grade math 
Anonymous,
10

4th grade math 
rebecca rosenjust,
the answer i got was 7 tennis balls

4th grade math 
Dieunie jean,
There are 8 pencils in a package how many packages will be needed for 28 children if each child gets 4 pencils