Estimating Sums and Differences

Discover a flexible estimation strategy called 'compatible numbers.' Learn how to find numbers that are close to the originals and easy to compute with mentally, like pairs that make a ten or a hundred.

Apply your rounding skills to estimate the answers to addition problems (sums). This stack includes problems with rounding to the nearest ten and nearest hundred, plus word problems.

Use your rounding skills to find approximate answers for subtraction problems (differences). This stack covers rounding to both tens and hundreds and solving estimation word problems.

Build on your rounding skills by learning to round three-digit numbers to the nearest hundred. This stack focuses on identifying the correct place value and applying rounding rules to larger numbers.

Learn the fundamentals of estimation and practice the essential skill of rounding two-digit numbers to the nearest ten. This is the first step to making math problems easier!