What do we get when we take away 12900 from 13800?
900
To take away means to subtract.
So, to find what we get when we take away 12900 from 13800, we have to subtract 12900 from 13800.
TThThHTO2181/3/800−12900900
∴ We get 900 when we take away 12900 from 13800.