AI Tutor
Imagine your friend buys 3 slices of pizza for 2eachandtellsyouthecashierchargedthem2 each and tells you the cashier charged them 600.
You would know instantly that something went wrong because that price is not reasonable, meaning it does not make sense in real life.
How do mathematicians spot these wild mistakes before handing in their work?

The Reality Check

A reality check means looking at your answer and asking if that amount could actually happen in the real world.
If a problem asks how many buses a school needs for a field trip, an answer of 0.50.5 buses or 400400 buses fails the reality check immediately.
What if your answer is possible in real life, but the math still feels a little off?

The Estimation Check

An estimate is a quick, close guess you make using friendly rounded numbers in your head.
If you multiply 48×648 \times 6, round 4848 up to 5050. Because 50×6=30050 \times 6 = 300, your exact answer must be close to 300300.