Autumn Myst
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Transcript of Autumn Myst
Autumn MystYour 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?
• Would you pay $93?
• Of course not!
23
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.
• The 4 has a decimal after it.2.3 + 4. + 5.023
• Line up the decimal• Fill in zeros
2.3
4.
5.0232.300
4.000
5.023
11.323
Subtraction • Line up the decimal• Fill in Zeros• Put the larger number on top