Tom had 7/12 of a pizza. his little sister came along and took 2/5 of his pizza away. how much pizza does tom have left?

To find the answer,we can first calculate how much her sister took away by multiplying the original amount he has to the amount her sister took.

Her sister has:
7/12×2/5
=7/30

We can then find the amount of pizza left by deducting the pizza he has to the answer we found above:

7/12-7/30
=35/60- 14/60
=21/60
=7/20

Therefore he has 7/20 of a pizza left.

An alternative way to find the
7/12×(1-2/5)
=7/12×3/5
=7/20

Hope it helps!