Apply addition and subtraction rules
Key notes:
On a number line, numbers to the left of 0 are negative. Numbers to the right of 0 are positive.
Learn with an example
🎯 The number line shows an unknown number, y.
Is –y positive or negative?
- positive
- negative
The unknown number y is to the left of 0. So, y is negative.
The opposite of a negative number is positive. So, –y is positive.
🎯 The number line shows an unknown number, q.
Is q positive or negative?
- positive
- negative
The unknown number q is to the right of 0. So, q is positive.
🎯 The number line shows an unknown number, a.
Is a positive or negative?
- positive
- negative
The unknown number a is to the right of 0. So, a is positive.
Let’s practice!🖊️
