Seven ninths minus four ninths is 1/3.
Four and four-ninths
When you add three of something to four of something, you get seven of something. It doesn't matter what the somethings are. Think of ninths as somethings. If you add three ninths and four ninths, you have to wind up with seven ninths. You can't wind up with seven eighteenths, because you weren't adding eighteenths to begin with.
Five-ninths must be added to four-ninths to make a whole.
Anything minus itself is zero.
When you add three of something to four of something, you get seven of something. It doesn't matter what the somethings are. Think of ninths as somethings. If you add three ninths and four ninths, you have to wind up with seven ninths. You can't wind up with seven eighteenths, because you weren't adding eighteenths to begin with.
Seven ninths minus four ninths is 1/3.
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Four and four-ninths
3 times four ninths is 12 ninths
One whole is nine ninths. Nine ninths minus four ninths equals five ninths.
Two thirds is six ninths; six ninths minus four ninths is two ninths.
When you add three of something to four of something, you get seven of something. It doesn't matter what the somethings are. Think of ninths as somethings. If you add three ninths and four ninths, you have to wind up with seven ninths. You can't wind up with seven eighteenths, because you weren't adding eighteenths to begin with.
Four ninths of 108 is 48.
2
Five-ninths must be added to four-ninths to make a whole.
Anything minus itself is zero.