Math 7. Be sure the decimal points are lined up This will cause every other digit to fall in place...
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MORE DECIMALS Math 7
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Transcript of Math 7. Be sure the decimal points are lined up This will cause every other digit to fall in place...
MORE DECIMALSMath 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 Add or subtract like you normally would
(don’t forget to “carry” or “borrow” when needed)
EXAMPLES OF ADDING DECIMALS
79.4 + 35.235
36.25 + 123.9953
14 + 9.556
Add mentally: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
DECIMALS65.3 – 12.1
19.56 – 11.3
35.6328 – 8.519
134.55 – 104.475
220 – 147.64
3,765.08 – 1,268.582
WORD PROBLEMSTITLE MINUTES
76 Trombones 3.12
Stars and Stripes Forever
3.52
Born in the USA
4.65
America the Beautiful
3.63
Yankee Doodle Dandy
2.5
The Star-Spangled Banner
4.5
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?
MORE WORD PROBLEMSTITLE MINUTES
76 Trombones 3.12
Stars and Stripes Forever
3.52
Born in the USA
4.65
America the Beautiful
3.63
Yankee Doodle Dandy
2.5
The Star-Spangled Banner
4.5
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?
PROPERTIES OF ADDITION
Identity Property of Addition: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
MORE PROPERTIES OF ADDITION
Commutative Property of Addition:3.2 + 6.7 = 6.7 + 3.2 OR x + y
= y + x
The Commutative Property states that it does not matter which order you list the numbers to add them
MORE PROPERTIES OF ADDITION
Associative Property of Addition:(2.5 + 6) + 4 = 2.5 + (6 + 4)
OR(a + b) + c = a + (b + c)
The Associative Property of Addition states that if you have 3 or more numbers that are all being added together, you can add any two at a time
