If a person has good basic arithmetic skills and it is a priority for them, then yes they can use coins easily. However, a lot of people either can't do the math or are unwilling to use change correctly.
For myself, it's such a priority that I'll get upset with myself if I have more than 4 pennies.
Japan has more coins (in regular use) than USA, so giving the correct amount is even more important or you'll end up carrying a lot of coins. 1000 yen is the smallest bill so... Example: 999 yen. 500,4x100,50,4x10,5,4x1 yen coins, 19 coins total.
For myself, it's such a priority that I'll get upset with myself if I have more than 4 pennies.
Japan has more coins (in regular use) than USA, so giving the correct amount is even more important or you'll end up carrying a lot of coins. 1000 yen is the smallest bill so... Example: 999 yen. 500,4x100,50,4x10,5,4x1 yen coins, 19 coins total.