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Math Integer Presentation

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by

Paula Bondoc

on 11 September 2013

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Transcript of Math Integer Presentation

Integers:
and how to use them
Addition
Subtraction
Multiplication and Division
Practice

Adding Integers
Rules:
Same Sign Sum
keep the same sign
-if the problem has the same signs, your answer will have the same sign.
ex. 2+2=2 -4+(-3)=(-7)
Different Sign Difference
keep the sign of the most
-if there's more of that sign, you will keep that sign.
ex. *4+(-8)=(-4) 8+(-4)=4
*notice how the number (4) is actually bigger than (-8), but there are more amount of negatives than there are positives, so you will have a negative answer.
Subtracting Integers
Rules:
Keep, Change, Change
the first number, "-" sign to "+", and the sign of the next number
ex. 2-5 -4-(-9)
2+(-5) -4+(+9)
keep:
change:
change:
1.)
2.) follow addition rules
-after keep, change, change, follow addition rules.
ex. 2+(-5)=(-3) -4+(+9)=5
Keep, Change, Change
Multiplication and Division
Rules:
Same Sign, Positive
If the numbers have the same signs, the answer is always positive.
-multiply and divide as you normally would.
ex. -4 x (-2) = 8 -8 ÷ (-4) = 2
Other Methods:
If you're adding numbers with different signs, it's just like subtracting. Except sometimes, you have to put a negative sign.
ex. -7+9 = 2 -6+3=-3
Different Sign, Negative
If it has different signs, the answer is always negative.
-multiply and divide normally.
ex. -9 x 2 = -18 3 x (-4) =-12
Practice:
1.) 3+4=?
2.) 6+(-9)+2=?
3.) -20+17=?
7
-1
-3
Other Methods: (without KCC)
Subtracting a negative number with a positive number is just like adding, just add a negative sign to your final answer!
ex. -3-4=-7 -5-6=-11
Questions:
Practice:
1.) 20÷(-4)=?
-5
2.) -14x2=?
-28
3.) -7x(-5)=?
35
Practice:
1.) 8-5=?
2.) 21-(-7)=?
3.) -4-5=?
3
28
-9
Addition: Subtraction:
Multiplication: Division:
1.) 6-10 =
2.) -29+17=
3.) 38+(-39)=
4.) -15+20=
5.) -8+5=
1.) 9-23=
2.) 1-9=
3.) -12-(-24)=
4.) -13-20=
5.) 2-(-23)=
1.) 3x(-3)=
2.) -7x2=
3.) 3x(-5)=
4.) -4x4=
5.) 4x(-3)=
1.) 36÷(-9)=
2.) -21÷3=
3.) -40÷(-2)
4.) -125÷5
5.) 28÷(-4)
Addition:
1.) -4
2.) -12
3.) -1
4.) 5
5.) -3
Subtraction:
1.) -14
2.) -8
3.) 12
4.) -33
5.) 25
Multiplication:
1.) -9
2.) -14
3.) -15
4.) -16
5.) -12
Division:
1.) -4
2.) -7
3.) 20
4.) 25
5.) -7
ANSWER KEY:
Full transcript