Curated OER
Estimate Sums and Differences
In this estimating sums and differences practice learning exercise, students sharpen their problem solving skills as they solve 6 story problems.
Curated OER
Number Sense
First graders practice rounding 4 digit numbers using place value concepts. In this estimating sums and differences lesson plan, 1st graders explore clustering, rounding, and front end estimation as methods for rounding decimals.
Birdville Independent School District
Friendly Numbers
There are a number of different strategies young mathematicians can use when adding two-digit numbers. This instructional activity focuses on making addition easier by rounding the addends to friendly numbers, with the resulting sum...
Curated OER
Estimate, Solve, and Check
Young scholars estimate, solve, and check a series of addition and subtraction number and word problems. They write their estimates on a recording sheet, compute and write the answer in the next column, and check their answer with a...