Question

Find ( -18) + ( -15 ) + 10 .

Answer 1

Rules in adding integers :

1. Same signs (+)

take the sum of the integers and it is a positive integer

2. Same signs (-)

take the sum of the integers and it is a negative integer

3. Different signs (+ and -)

Take the difference of the integers then follow the sign of the larger number

From the given :

$(-18)+(-15)+10$

You can work with the integers with the same sign first then proceed with the integers with different signs.

Add integers with the same signs

(-18) + (-15) = -33 (Rule #2)

Now we have :

$(-33)+10$

Using Rule #3

Take the difference :

33 - 10 = 23

Then the sign will follow the sign of the larger number which is -33

So the answer is -23