More decimals

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# More decimals - PowerPoint PPT Presentation

More decimals. Math 7. ADDING AND SUBTRACTING DECIMALS. Be sure the decimal points are lined up This will cause every other digit to fall in place Fill in any blank spaces with zeros Carry the decimal point down to where your answer will go

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### More decimals

Math 7

• Be sure the decimal points are lined up
• This will cause every other digit to fall in place
• Fill in any blank spaces with zeros
• Carry the decimal point down to where your answer will go
• Add or subtract like you normally would (don’t forget to “carry” or “borrow” when needed)

79.4 + 35.235

36.25 + 123.9953

14 + 9.556

0.7 + 12.5 + 0.3

51.9 + 0.1 + 12

2.25 + 58 + 3.75

30.6 + 12.5 + 0.4

EXAMPLES OF SUBTRACTING DECIMALS

65.3 – 12.1

19.56 – 11.3

35.6328 – 8.519

134.55 – 104.475

220 – 147.64

3,765.08 – 1,268.582

WORD PROBLEMS

A marching band has 6.5 minutes to perform at half-time. Does the band have enough time to play “America the Beautiful” and “Yankee Doodle Dandy”? If so, how much time will remain?

MOREWORDPROBLEMS

How long will it take the band to play “Stars and Stripes Forever” and “The Star-Spangled Banner”?

MORE WORD PROBLEMS

The Empire State Building is 443.2m tall. The Eiffel Tower is 320.8m tall. Find the difference between the heights of the two buildings.

The original price of a jacket is \$79.95. How much did you save if you bought the jacket on sale for \$62.79?

3.2 + 0 = 3.2 OR x + 0 = x

• The Identity Property states that any number plus zero will get you back to the number you started with
• 0 is called the Identity Element for addition