Today's drill
How To Improve Mental Math
Updated September 25, 2026
Mental arithmetic slows you down. Every sum costs attention, so there is less left for the actual problem.
Do this one today
Estimate first
A rough answer first stops you from trusting a wrong exact one. 18% of 240 is near 20% of 240, so about 48 (exactly 43.2).
Estimate three percentages today before you calculate them.
Also in this one
- Round, then adjust
That one comes with IQ Tester, one a day, aimed at whichever of these is actually yours.
Which one is yours?
Find your weak spots in two minutes, then train them with one short drill a day, picked for you.