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Secondary 1 | Maths
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rick
Rick

Secondary 1 chevron_right Maths chevron_right Singapore

is this correct? if it is can sm1 pls explain how to like minus n add bcs im confused

Date Posted: 3 months ago
Views: 53
AC Lim
AC Lim
3 months ago
Correct.
-(-2) = -1 × -2 = 2
So..
- × - = +
- × + = -
+ × + = +
+ × - = -
rick
Rick
3 months ago
wait but wat if dont have times in the question
AC Lim
AC Lim
3 months ago
If have ( ) mean 1 × number in bracket.
If - ( ) mean -1 × number in bracket.

If don't have times
Mean 8 - 2 = 6 or 8 + 6 = 14 straight away.

-2 + 6 = 4

-6 + 4 = -2
In this equation, we can say like I have 4 dollars, I owe 6 dollars, so I still owe 2.
Owe 6 + 4 = owe 2
-6 + 4 = -2
For easy explanation and remember.
rick
Rick
3 months ago
ohh okok tysm
AC Lim
AC Lim
3 months ago
In future if there are many times with different + -

Like -2 × 3 × -4 = 24
-2 × -3 × -4 = -24
How to determine answer is + or -
Explanation
- × - × - = -
- × + × - = +
Simply count the total stroke
- = 1 stroke
+ = 2 stroke

So
- × - × - = - { - - - = 3 strokes, odd number, answer is -}
- × + × - = + {- + - = 4 strokes, even number , answer is +}

Example -2 × -3 × -1 × -5 = 30
{- - - - = 4 strokes, answer is +30}
When number is +30, we just write 30 no need +30.
rick
Rick
3 months ago
thank u v much!

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Yes. Correct.
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AC Lim
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