Estimate and check two-step answers
3rd Grade Math practice: A library had 612 books. It got 189 more books and later gave away 205 books. About how many books does the library have now? Round to the nearest ten.. Part of two-step add subtract (Two-step add subtract).
~10 min
Estimate each step to predict a reasonable answer.
Rounding to Estimate
To estimate, round each number in the story to the nearest ten or hundred. Then, perform the addition or subtraction steps with the rounded numbers to find a rough goal for your answer.
💡 Rounding makes the numbers easier to work with in your head.