Adding and Subtracting Decimals

Front

What is a decimal?

Back

A decimal is a fraction whose denominator is a power of ten, represented with a decimal point. For example, 0.5 is a decimal representation of 5/10.

Front

How do you add decimals?

Back

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

Front

How do you subtract decimals?

Back

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

Front

What is the sum of 4.62 and 7.7?

Back

The sum is 12.32.

Front

If Jerry bought 6.95 lbs of jelly beans and 1.75 lbs were cherry flavor, how do you find the weight of lime flavor?

Back

Subtract the weight of cherry flavor from the total weight: 6.95 - 1.75 = 5.2 lbs.

Front

What is the difference between 39.3 feet and 17.6 feet?

Back

The difference is 21.7 feet.

Front

How do you calculate the total cost of multiple items?

Back

Multiply the cost of one item by the number of items. For example, $2.50 x 3 = $7.50.

Front

What is the value of 4.18 + 3.11?

Back

The value is 7.29.

Front

What does it mean to round a decimal?

Back

Rounding a decimal means adjusting its value to make it simpler while keeping it close to the original value. For example, rounding 2.67 to the nearest whole number gives 3.

Front

What is the place value of the digit 5 in 3.45?

Back

The place value of 5 in 3.45 is in the hundredths place.