Decimals and Place Value & Comparing Decimals Lessons 3.1 & 3.3

Decimals & Place Value Where do you see decimals? Money Times (races) Scores We will look at how to write decimal amounts in words, numbers, or using models.

Decimals & Place Value Place Value Chart. Hundred thousands Ones Tens Hundreds Thousands Ten-thousands Tenths Hundredths Thousandths Ten-thousandths Hundred-thousandths

Decimals & Place Value Example 1 – Write the following amount in word form Eighteenand twenty-one Lowest place value? thousandths

Your Turn Question #1 – Write the following amount as a decimal. Ninety and one-hundred nine thousandths

Your Turn Question #2 – Write the following amount as a decimal. Seventy-two and seven hundredths 72.07

Comparing Decimals Comparing decimals (greater than, less than, or equal to) is similar to comparing whole numbers. Special attention must be given to place value to compare decimals.

Comparing Decimals To compare/order decimals: 1 st - line up the decimal points. 2 nd – start from the highest place value, move right and find where the digits are different. 3 rd - Compare these digits (>, <, or =)

Comparing Decimals Example 2 Compare the following numbers: ___ A. > B. < C. = <

Your Turn Question #3 Allison has $ Greg has $ Compare the two amounts of money. Who has the most money? A. Allison B. Greg Allison has the most money.

Your Turn Question #4 Compare the following numbers: ____ A. > B. < C. =

Equivalent Decimals Equivalent decimals are decimals that name the same number (such as and ), or they are equal. Annexing means to add zeros after the last non-zero digit in a decimal. These zeros are placeholders.

Comparing Decimals Example 3 Order the following numbers from least to greatest: The order of the numbers from least to greatest is 9.399, 9.41, ,

Your Turn Question #5 A dance competition is held where the group with the highest score wins. Place the following scores in order from greatest to least to determine which team wins the competition. Dance Scores Team ATeam BTeam CTeam D

Your Turn Question #5 (answer choices) A)Team A, Team B, Team C, Team D B)Team B, Team C, Team A, Team D C)Team C, Team A, Team D, Team B D)Team D, Team B, Team A, Team C

Your Turn Question #5 (procedure to follow) (Team C), (Team A), (Team D), (Team B) Team A Team B Team C Team D Team C wins the dance competition.

Independent Practice Time Please put the following numbers in order 1.4, 1.04, 1.004, 1.007, 1.7,.07

And then these

MA.A – knows word names and standard numerals for whole numbers, fractions, decimals (through hundred- thousandths) and percents. MA.A – reads and writes whole numbers and decimals in expanded form. MA.A – compares and orders fractions and decimals using graphic models, number lines, and symbols. Sunshine State Standards (

Your Turn Question Arrange the prices of the CDs listed below from greatest to least: $13.99$14.09$13.49$ A)$13.45, $13.49, $13.99, $14.09 B)$13.45, $13.49, $13.99, $14.09 C)$14.09, $13.99, $13.45, $13.49 D)$14.09, $13.99, $13.49, $13.45 The prices of the CDs in order from greatest to least are $14.09, $13.99, $13.49, and $