Front

What is estimation in math?

Back

Estimation is a way to find a number that is close to the exact amount, often used to make calculations easier.

Front

What are compatible numbers?

Back

Compatible numbers are numbers that are easy to compute with mentally, often rounded to make addition or subtraction simpler.

Front

Estimate the sum of 76 + 26 using compatible numbers.

Back

75 + 25 = 100.

Front

What is the estimated value of 836 when rounded to the nearest ten?

Back

840.

Front

Estimate the sum of 56 + 79.

Back

140.

Front

What is the estimated value of 54 when rounded to the nearest ten?

Back

50.

Front

Estimate the value of 796 when rounded to the nearest hundred.

Back

800.

Front

How do you round a number to the nearest ten?

Back

Look at the digit in the ones place. If it's 5 or more, round up. If it's 4 or less, round down.

Front

What is the purpose of estimation?

Back

Estimation helps to quickly assess the size of a number or the result of a calculation without needing exact figures.

Front

What is the estimated sum of 80 + 30?

Back

110.