Decimals are numbers that show parts of a whole. A decimal point separates the whole number part from the fractional part.
The decimal point is always read as “and” when reading a number aloud. For example, 4.56 is read as “four and fifty-six hundredths.”
Each digit in a decimal number has a value based on its place. The places to the right of the decimal point represent tenths, hundredths, thousandths, and so on.
Each place to the right of the decimal point is ten times smaller than the one before it. For example, tenths are ten times larger than hundredths.
To find the place value of a digit in a decimal, locate its position to the right or left of the decimal point and name the place accordingly.
You can use a place value chart to help organize digits by their place. This makes comparing decimals easier.
To compare decimals, line up the decimal points and compare digits from left to right. The first different digit determines which number is greater.
Always compare digits in the same place value. You can add zeros to the end of a decimal to make comparison easier (for example, 0.5 = 0.50).
When reading decimals, say the whole number first, then say “and,” followed by the fractional part with its place name. When writing, use digits and a decimal point.
Do not say “point” when reading the number in word form. Always name the place value of the last digit instead.