Decimal Operations Review

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

What is the area of a rectangle?

Back

The area of a rectangle is calculated by multiplying its length by its width. Formula: Area = Length × Width.

Front

How do you estimate the sum of decimals?

Back

To estimate the sum of decimals, round each decimal to the nearest whole number and then add the rounded numbers.

Front

What is the process for subtracting decimals?

Back

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

Front

How do you multiply decimals?

Back

To multiply decimals, multiply the numbers as if they were whole numbers, then count the total number of decimal places in both factors and place the decimal point in the product accordingly.

Front

What is the process for dividing decimals?

Back

To divide decimals, move the decimal point in the divisor to the right to make it a whole number, then move the decimal point in the dividend the same number of places and divide as usual.

Front

What is a reasonable estimate?

Back

A reasonable estimate is a rough calculation that is close to the actual value, often achieved by rounding numbers to make calculations easier.

Front

How do you find the total length of multiple items?

Back

To find the total length of multiple items, add the lengths of each item together.

Front

What is the importance of decimal places?

Back

Decimal places indicate the precision of a number. More decimal places mean a more precise value.