Posted by cristina on Monday, February 4, 2013 at 5:47pm.
I'd use counters -- like M & Ms or pennies.
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.
THANK YOU by the way!
Put out 15 objects.
Then have your child take 9 of them away.
How many are left?
that's not the answer. its how to get her to 12 is 9 more than 3 that equals 15
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
x+y = 15
x-y = 9
2x = 24
x=12 , then y = 3
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