9/10 is already in its reduced terms
It doesn't reduce.
reduce something is to make the amount of something smaller. For example you can reduce your electric bill by unplugging the refrigerator.
Reduce refers to your usage of non-recycleable materials.
3 1/4 doesn't reduce
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nine-tenths (9/10) equals 90%
Reduce the protection time provided by the gloves
Reduce in size; reduce physically. Make smaller.
To reduce To reduce
Reduce
reduce fat
reduce (just like you did)
you can reduce it by stuff
You cannot reduce a-2.
Reduce your angry with meditate.
You can reduce the waste by reducing the trash
"The 3 Rs" are most commonly referred to as "readin', writin', and 'rithmatic".