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Page 1: Autumn Myst

Autumn MystYour Subtitle Goes Here

Page 2: Autumn Myst

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

Page 3: Autumn Myst

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.

Page 4: Autumn Myst

To insure that like place values are

added, line up the decimal first

Page 5: Autumn Myst

• 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

Page 6: Autumn Myst

Subtraction • Line up the decimal• Fill in Zeros• Put the larger number on top