Transcript Add, Subtract and Compare

Autumn Myst
Your Subtitle Goes Here
Add, Subtract and Compare
• Suppose you go to a store and
purchase a $23 item and a $7
item.
• What would you say if the clerk
added the items this way?
23
• Would you pay $93?
• Of course not!
7
93
Place Value
• The numbers were not lined up
correctly.
• The 7 should be in the one's
place.
• When adding, ones should be
added to ones, tens to tens, and
hundreds to hundreds.
• The same is true for tenths,
hundredths, and thousandths.
To insure that
like place
values are
added, line up
the decimal first
• Follow the example: 2.3 + 4 +
5.023
• Even whole numbers have a
decimal.
2.3 it.
• The 4 has a decimal after
4.
2.3 + 4. + 5.023
• Line up the
• Fill in zeros
2.300
4.000
decimal
5.023
11.323
5.023
Subtraction
• Line up the decimal
• Fill in Zeros
• Put the larger number on top