Writing, Comparing, and

Rounding Decimals

Section (not in the book)

Vocabulary

• None

Know your place values!

__ __ __ . __ __ __ __ __Hun

dred

sTe

nsO

nes

Tent

hsH

undr

edth

sTh

ousa

ndth

sTe

n Th

ousa

ndth

s

Hun

dred

- Th

ousa

ndth

s

ALL place values after the decimal end with ‘ths’!

Can you write/ say the number?

• Twenty-one and sixty-seven hundredths

• Five and thirty-four thousandths

• 2.504

• 105,000.15

Comparing Decimals

Step 1: line up the decimals

Step 1b: add ‘0’ as place holders

Step 2: start with the highest place value, then go down

>, <, or =

4.529 vs. 45.29

85.099 vs. 85.0990

12.481 vs. 12.089

687.1 vs. 9.9999

108.098 vs. 108.1

Rounding

• Step 1: Identify the place value you are rounding to. (underline it!)

• Step 2: Look, ONLY, at the number to the right of that place value.

• Step 3: If that digit is:0-4, the underlined number stays the

same.5-9, the underlined number increases by

one.

Practice

• Round 45.05891 to the nearest hundredths.

• Round 7.04829 to the nearest tenth.

• Round 15.9999 to the nearest thousandths.

*Important: there must be a digit on the place value you round to, and NO digit after that place value.

Homework

• Worksheet– Rounding & writing decimals – Comparing decimals– Comparing numbers in different situations