Friday, 17 April 2020

Points to Remember


Points to keep in mind:-

While solving Addition or Subtraction the greater number sign has to be written to its answer

Eg-) -6 + 5= -1

 (- +=- so 6-5= 1 and 6 is the greater number and its sign 
is – therefore the answer will be -1)

Eg 2) -7 + (-2)= -9   

Must remember each number has it sign i.e. positive (+) or negative (-) to its right-hand side, If it has 2 signs convert it into 1 sign and then solve.

(Here,-7 has one sign and 2 is having 2 signs that is + and – so convert it into one sign from the above table
i.e. + - = -

Therefore -7 -2 nowhere both the numbers are having their own signs, then our next step will be considering the signs first and then the numbers
-     - = +, 7+2= 9 and sign of the greater number is -, therefore answer is -9)


While solving Multiplication or Division sums greater number sign is not considered and the sign (table) is considered.

Eg 1) -6 X 1= -6

(Here first multiply the numbers 6 X 1=6, then consider the sign, 6 is having – sign and 1 has no sign, (if any number doesn't has any sign it will be considered as positive (+) sign always) and 1 is having + sign
Therefore, - + =- So the answer will be -6

Eg 2) -7 X -3 = 21
(First, multiply the numbers i.e. 7X3=21, then considered the sign here 7 is having negative (-) sign and 3 is also having negative (-) sign, - - = + therefore 21 will have + sign)

(Same steps for Division)

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