# Fractions

1/2 of the birds at a pet store are yellow. tara buys 1 of the yellow birds. then 1/3 of the yellow birds at the store are yellow. how many yellow birds were at the pet store before tara bought one?

how can i explain it step by step in 3rd grade version

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1. well, first I have to do it

b - 1 = total birds at end
yellow birds:
(1/2) b - 1 = (1/3)(b-1)

b/2 = 1 -1/3 + b/3

3b/6 -2b/6 =2/3
b/6 = 2/3
b = 4
yellow = b/2 = 2

put 4 balls in a box, half of the yellow, and do the experiment

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posted by Damon
2. so,its 2/6?

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posted by Hannah
3. Two of the four birds in the store were yellow.

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posted by Damon
4. then when you take a yellow out, you have 2 blue and one yellow remaining

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posted by Damon
5. Thank you,Damon!

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posted by Hannah
6. You are welcome :)

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posted by Damon
7. I'm still confused as to how you got the 4

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posted by Jelen
8. Me too

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