This activity is meant for pairs of students. Partner E chooses a card, rounds the numbers, then adds or subtracts to find an estimate. Partner C uses a calculator to compute the exact answer. When finished they compare answers and trade jobs.
This activity gives practice rounding three to six digit numbers, reading numbers, practice adding or subtracting, and using a calculator.
It is meant to be printed on two sides so the name of the activity is on one the back side of the card.