Negative numbers are numbers below zero on a number line. -5 is smaller than 2.
When you are adding or subtracting negative numbers you need to remember:
When a + and - are next to eachother they turn into a -.
When a - and + are next to eachother they turn into a -.
When a - and - are next to eachother they turn into a +.
When a + and + are next to eachother they turn into a +.
BRACKETS COME FIRST!
When you are multiplying or dividing negative numbers you need to remember:
Odd amount of negative's in questions means a negative answer.
Even amount of negative's in questions means a positive answer.
IF YOU ARE MULTIPLYING, DIVIDING, ADDING OR SUBTRACTING USE BRACKETS ON A CALCULATOR!
MULTIPLYING
EG1) -5 x -4 = 20
Because it is a minus x a minus so it equals a +number.
EG2) -7 x 8 = -56
Because it is a minus x a +number it equals a minus.
DIVIDING
EG1) -24 divided by -8 = 3
Because it is a minus x a minus so it equals a +number.
EG2) -20 divided by 10 = -2
Because it is a minus x a +number it equals a minus.
ADDING AND SUBTRACTING
EG1) -5 +-9 = ?
REMEMBER THE RULES!
The + and - are next to eachother so it turns into a MINUS!
The sum is now -5 -9.
-5 - 9 = -14
EG2) -9 - (-5) x (+2) = ?
REMEMBER THE RULES!
Do the brackets = -5 x 2 = -10
The new sum is -9 - - 10 .
There is 2 takeaway's!
The takeaway's turn into a plus.
-9 + -10.
-9 + -10 = 1
Questions
1. -7 - - 8 = ?
2. (-3) x (-15) = ?
3. (+2) X (-5) = ?
When you are adding or subtracting negative numbers you need to remember:
When a + and - are next to eachother they turn into a -.
When a - and + are next to eachother they turn into a -.
When a - and - are next to eachother they turn into a +.
When a + and + are next to eachother they turn into a +.
BRACKETS COME FIRST!
When you are multiplying or dividing negative numbers you need to remember:
Odd amount of negative's in questions means a negative answer.
Even amount of negative's in questions means a positive answer.
IF YOU ARE MULTIPLYING, DIVIDING, ADDING OR SUBTRACTING USE BRACKETS ON A CALCULATOR!
MULTIPLYING
EG1) -5 x -4 = 20
Because it is a minus x a minus so it equals a +number.
EG2) -7 x 8 = -56
Because it is a minus x a +number it equals a minus.
DIVIDING
EG1) -24 divided by -8 = 3
Because it is a minus x a minus so it equals a +number.
EG2) -20 divided by 10 = -2
Because it is a minus x a +number it equals a minus.
ADDING AND SUBTRACTING
EG1) -5 +-9 = ?
REMEMBER THE RULES!
The + and - are next to eachother so it turns into a MINUS!
The sum is now -5 -9.
-5 - 9 = -14
EG2) -9 - (-5) x (+2) = ?
REMEMBER THE RULES!
Do the brackets = -5 x 2 = -10
The new sum is -9 - - 10 .
There is 2 takeaway's!
The takeaway's turn into a plus.
-9 + -10.
-9 + -10 = 1
Questions
1. -7 - - 8 = ?
2. (-3) x (-15) = ?
3. (+2) X (-5) = ?