**1. How many integers are there?**

There are an INFINITE number of integers stretching back in the negative direction and forward in the positive direction, ←...-3, -2, -1, 0, 1, 2, 3...→

**2. What is a negative integer?**

A negative number is an integer that is less than zero. e.g. -3 is a negative number.

**3. What sign does the answer have if I multiply a negative number by another negative number?**

Strangely enough the answer is

POSITIVE! e.g. -4 × -3 =+12

**4. What is the difference between integers and natural numbers?**

Natural numbers are the

countingnumbers N = {1, 2, 3, 4, ...}

Integers include 0 and all of the negative whole numbers {...-3, -2, -1, 0, 1, 2, 3...}