Readings & Meanings:
how many, some
How old/how many years?
How much for the fish roe?
I'll take geometry class.
Wow, check this kanji out. We've got double thread radicals 幺 (as seen in 糸).
We've got 人 in the bottom left.
And we've got our newly-learned spear radical, 戈, cutting this kanji in half.
So unless you're honest about the AMOUNT (幾) of thread you're selling, people are gonna get cut.
As a general rule, don't use this kanji for いくら and いくつ. I think it's cool to know where the hiragana came from, but it's mainly academic knowledge. Common use dictates that you should write "how many" and "how much" in hiragana.