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The 1,000 Yen note is about $10 USD.
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100¥ is about $1 USD
50¥ is about 50 cents
10¥ is about 10 cents
5 ¥ is about 5 cents
1 ¥ is just like our penny (and feels fake and almost weighs nothing).
In Japan, the money is always clean and barely looks used.
Foreign debit/credit cards in Japan usually work at the stores, but not always at the ATM machines, which are plentiful. However, the Post Offices have ATMs that accept foreign cards (and have "English" and sometimes "Korean"/"Portuguese" buttons for easy use).
One of the other issues with getting cash, as at least where we live, is that there are no ATM machines open late at night or early in the morning - so you just have to plan well when you need cash.
When you are here, you'll have no issues, as we have both foreign and Japanese bank accounts to get money.
And always, because Japan is so safe, you can easily walk around with money or ask for help when you are trying to figure out how much something is, because they are definitely not trying to rip you off!