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