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 the formula: P = 2(length + width).

Front

If a pizza costs $17.97 and drinks cost $3.90, what is the total cost?

Back

The total cost is $17.97 + $3.90 = $21.87.

Front

How do you find the average cost per person if three friends share a bill of $21.87?

Back

Divide the total bill by the number of friends: $21.87 ÷ 3 = $7.29.

Front

What is the total cost of items if Bisi bought poster board for $2.65, watercolors for $4.95, brushes for $3.49, and glitter for $6.89?

Back

Total cost = $2.65 + $4.95 + $3.49 + $6.89 = $17.98.

Front

If Bisi pays $20 for her items, how do you calculate her change?

Back

Change = Amount given - Total cost. Change = $20 - $17.98 = $2.02.