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I need help teaching my 2nd grader how to come up with the answer. Easy for an adult..difficult to explain to a child.

I am thinking of 2 numbers who sum is 15.
One of the numbers is 9 more than the other. Got the 12 plus 3 part. Help me explain it in its simplest terms

  • math -

    I'd use counters -- like M & Ms or pennies.

  • math -

    That is my thought but how do I pose the question? I took a deck of cards for counters and tried to figure out how to go about it.

  • math -

    THANK YOU by the way!

  • math -

    Put out 15 objects.

    Then have your child take 9 of them away.

    How many are left?

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    that's not the answer. its how to get her to 12 is 9 more than 3 that equals 15

  • math -

    start with your 15 objects
    take 1 away, the pile left is 14 more than what she took away, and 14-1=13
    take 2 away, the pile left is 13 more than what she took away, and 13-2=11
    take 3 away, the pile left is 12 more than what she took away, and 12-3=9

    ahhh, one is 3, the other is 12

    for yourself:

    x+y = 15
    x-y = 9
    add them
    2x = 24
    x=12 , then y = 3

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