4th grade math

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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 -

    answer is 10...i used guess and check ...!

  • 4th grade math -

    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 -

    i need help on fact families 6 and 5 pleaseeeeee answer me

  • 4th grade math -

    Estimating Products Example 7multiply42 is close to 7 multiply ?

  • 4th grade math -

    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 -

    10

  • 4th grade math -

    the answer i got was 7 tennis balls

  • 4th grade math -

    There are 8 pencils in a package how many packages will be needed for 28 children if each child gets 4 pencils

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