Basic Operations with 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 the fraction 1/2.

Front

How do you multiply a decimal by a whole number?

Back

To multiply a decimal by a whole number, multiply as if there were no decimal point, then place the decimal point in the product based on the number of decimal places in the original decimal.

Front

Calculate: 4 x 0.03

Back

0.12

Front

What is the process for adding decimals?

Back

Align the decimal points of the numbers, add as you would whole numbers, and place the decimal point in the sum directly below the aligned decimal points.

Front

Calculate: 14.3 + 2.68

Back

16.98

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, and move the decimal point in the dividend the same number of places. Then divide as usual.

Front

Calculate: 63.2 ÷ 5

Back

12.64

Front

How do you multiply two decimals?

Back

Multiply 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

Calculate: 3.8 x 0.10

Back

0.38

Front

What is the value of 0.5 + 0.25?

Back

0.75