Estimation is finding an answer that is close to the exact amount. It helps us make quick calculations without solving a problem exactly.
Estimation does not give the exact answer, but it helps check if your exact answer makes sense.
You should use estimation when the problem asks for an approximate answer or when checking if your exact answer is reasonable.
Estimation is especially helpful in real life, such as shopping, traveling, or solving word problems.
Rounding means changing a number to the nearest ten or hundred to make it easier to work with.
Always keep the digits to the left of the place value the same, and change the digits to the right to zeros.
To estimate a sum, round each number to the nearest ten or hundred, then add the rounded numbers together.
The estimated sum should be close to the exact sum, but it will be easier to calculate in your head.
Estimation helps you check your work, solve problems faster, and decide if your answer makes sense.
Estimation is a powerful tool for problem solving in school and everyday life.