Try to use exact change, or the nearest tenth above
There may be some other ideas about how to physically use the change after the 1, 5, and 10 yen coins have piled up on you, but I always advise to use the change as efficiently as possible before it gets to that point. One tip I have for how to use your change properly is to always try and match the number in the hundredths place on your total. For example, a total of 573 yen should prompt you to look for 3 yen. Pay with 603 yen, and get back three 10 yen coins as opposed to a handful of mixed change.