Rounding, adding, and subtracting decimals

Front

What is rounding?

Back

Rounding is the process of adjusting a number to make it simpler and easier to work with, while keeping its value close to what it was. For example, rounding 4.6 to the nearest whole number gives you 5.

Front

How do you round a decimal to the nearest hundredth?

Back

To round a decimal to the nearest hundredth, look at the third decimal place. If it's 5 or more, increase the second decimal place by 1. If it's less than 5, keep the second decimal place the same.

Front

What is the sum of 12.45 and 15.54?

Back

The sum is 27.99.

Front

How do you add decimals?

Back

To add decimals, align the numbers by the decimal point and add as you would with whole numbers, placing the decimal point in the answer directly below the other decimal points.

Front

What is the difference between 20.5 and 7.3?

Back

The difference is 13.2.

Front

How do you subtract decimals?

Back

To subtract decimals, align the numbers by the decimal point and subtract as you would with whole numbers, placing the decimal point in the answer directly below the other decimal points.

Front

What is 125.369 rounded to the nearest hundredth?

Back

125.37

Front

What is the nearest ten to 227?

Back

230

Front

What is the value of 20 - [(3x4) + (2x3)]?

Back

2

Front

What does it mean to estimate a sum?

Back

Estimating a sum means finding a rough value that is close to the actual sum, often by rounding the numbers before adding them.