Add, Subtract, Multiply, and Divide Decimals

Front

What is a decimal?

Back

A decimal is a number that includes a decimal point, which separates the whole number part from the fractional part. For example, 3.14 is a decimal.

Front

How do you add decimals?

Back

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

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 numbers and place the decimal point in the product accordingly.

Front

What is the rule for dividing decimals?

Back

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

Front

What is the perimeter of a rectangle?

Back

The perimeter of a rectangle is the total distance around it, calculated by adding the lengths of all four sides. The formula is P = 2(length + width).

Front

If a total bill is $17.97 and $3.90, what is the total amount spent?

Back

The total amount spent is $17.97 + $3.90 = $21.87.

Front

How do you find the change from a purchase?

Back

To find the change, subtract the total cost of the items from the amount given to the cashier. For example, if you give $20 for a $17.98 purchase, the change is $20 - $17.98 = $2.02.

Front

What does it mean to share a bill equally?

Back

To share a bill equally means to divide the total amount by the number of people sharing it. For example, if three friends share a $21.87 bill, each pays $21.87 ÷ 3 = $7.29.

Front

What is multiplication of decimals?

Back

Multiplication of decimals involves multiplying the numbers as if they were whole numbers and then placing the decimal point in the product based on the total number of decimal places in the factors.