# 5.1 – Rounding Decimals M illio n s H u n d red Tho u san d s Ten

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– read the whole number to the left of the decimal point, if there is one;
– read the decimal point as “and”;
– read the digits to the right of the decimal point just as you would read a whole number; and
– say the name of the place value of the digit in the smallest place.
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Decimals may be written in a variety of forms:
– Standard: 23.456
– Written: Twenty-three and four hundred fifty-six thousandths
-- Expanded: (2  10) + (3  1) + (4  0.1) + (5  0.01) + (6  0.001)
Thousandths
Hundredths
Tenths
Ones
Tens
Hundreds
Thousands
Ten Thousands
Millions
Hundred Thousands
5.1 – Rounding Decimals
Write each number in standard form, written form, and expanded form.
Example 1
Standard
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Written
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Expanded
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Example 2
Standard
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Written
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Expanded
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Rounding decimals is very similar to rounding whole numbers.
Look next door
5 or greater, add one more (to the underlined number)
4 or less it stays the same
As for the rest, their at the game!
Round 472.78 to the nearest tenth
472.78
Round 13.192 to the nearest hundredth
13.192
Think about it!! What would it mean if you are asked to round to the nearest whole number? Why?
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