Wednesday, 10/23-Estimation and Compatible Numbers

Front

What is estimation in mathematics?

Back

Estimation is a method used to find an approximate value that is close to the actual amount, often used when exact calculations are not necessary.

Front

What are compatible numbers?

Back

Compatible numbers are numbers that are easy to compute with mentally, often used for estimation.

Front

How do you estimate the sum of two numbers?

Back

Round each number to the nearest ten or hundred, then add the rounded numbers together.

Front

How do you estimate the difference between two numbers?

Back

Round each number to the nearest ten or hundred, then subtract the smaller rounded number from the larger one.

Front

If a number is closer to 8000 than 9000 on a number line, what is a good estimate for that number?

Back

About 8000.

Front

What is the best way to estimate 325 + 165?

Back

Round 325 to 300 and 165 to 170, then add: 300 + 170 = 470.

Front

How can you use a number line to estimate values?

Back

A number line helps visualize where numbers fall, making it easier to see which numbers are closer to each other.

Front

What does it mean if a point on a number line is less than halfway between two numbers?

Back

It means the value is closer to the lower number than the higher number.

Front

What is the estimated difference between 90 and 50?

Back

90 - 50 = 40.

Front

If a store has 154 bottles and 36 are left, how do you estimate how many were handed out?

Back

Estimate by subtracting: 154 - 36 is about 120.