Five Flat Objects, Five Sheets
noun
You know that 枚 is a flat objects counter. So, now we're counting! You have five flat objects.
ごまい
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
ステッカーを五枚、オマケに付けておきますね。
I’ll give you five stickers as a bonus too.
コピー用紙、あと五枚しかないよ。
There are only five sheets of copy paper left.
コンビニに行って、葉書を五枚買いました。
I went to a convenience store and bought five postcards.