Rounding & Estimation PRACTICE

Front

What is rounding?

Back

Rounding is the process of adjusting a number to make it simpler and easier to work with, usually to the nearest ten, hundred, or other place value.

Front

What does it mean to estimate?

Back

Estimating means making an educated guess about a number or quantity, often by rounding.

Front

How do you round the number 82 to the nearest ten?

Back

82 rounds to 80 because it is closer to 80 than to 90.

Front

How do you round the number 79 to the nearest ten?

Back

79 rounds to 80 because it is closer to 80 than to 70.

Front

What is the best estimate of 82 + 79?

Back

The best estimate is 160, by rounding 82 to 80 and 79 to 80, then adding.

Front

If there are 75 people on a bus and 14 get off, how do you estimate how many are left?

Back

You can round 14 to 10, so 75 - 10 = 65. The best estimate is about 70.

Front

What is the weight of the hammerhead shark?

Back

The hammerhead shark weighs 329 pounds.

Front

Where would you mark 329 pounds on a number line?

Back

You would mark it between 300 and 400, but closer to 300.

Front

How do you find out how much longer one time is than another?

Back

Subtract the shorter time from the longer time to find the difference.

Front

If Jakob flew a kite for 74 minutes and Addison for 89 minutes, how do you estimate the difference?

Back

Round 74 to 70 and 89 to 90. The difference is about 20 minutes.