Question

Write a rule you can use to find the sum of a positive integer and a negative integer without using counters,

Answer 1

We have to write a rule to find the sum of a positive integer and a negative integer.

We can say that:

If the numbers have different signs, we substract the absolute values, and leave the sign of the number with greater absolute vale.

Example:

$(-5)+3=-2$

If he numbers have the same sign, we add the absolute vales, and leave the sign of both numbers.

Example:

$(-7)+(-5)=-12$