8898=7
4566=2
1203=1
2313=0
4566=2
5464=1
7774=0
1003=2
9856=4
9955=2
1886=5
1231=0
8764=3
4500= ?
If you’re stumped, here’s a hint: an average five year old could get the answer….quite possibly more quickly than an adult could.
graph paper diaries 
2
I wouldn't have gotten it without the hint.
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Likewise, I say 2.
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If you want to know, I counted closed loops in the shapes of the numerals…
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