**Problem 1**: What number is at the mid-point of the real number line?
**Ans: 0**.

**Problem 2**: what numbers are at the end points of the real number line?
**Ans: -∞ is at the left end-point and ∞ is at the right end-point.**.

**Problem 3**: what is the general name for the numbers to the right of the mid-point of the real number line?
**Ans: positive numbers (+ve numbers).**

**Problem 4**: what is the general name for the numbers to the left of the mid-point of the real number line?
**Ans: negative numbers (-ve numbers). **

**Problem 5**: classify all the numbers of the real number line into two primary groups. indicate a member of each group.
**Ans: rational numbers and irrational numbers.**

**Problem 6**: broadly classify rational numbers into two groups.
**Ans: whole numbers and ratios of whole numbers.**

**Problem 7**: what ranges on the real number line represent fractions?
**Ans: the range between -1 and 0, -1<x<0; and the range between 0 and 1, 0<x<1.**

**Problem 8**: If n is an arbitrary whole number, what is the whole number immediately before n and what is the whole number immediately after n?
**Ans: n-1 is before n; n + 1 is after n.**

**Problem 9**: Classify the four basic arithmetic operations into two arithmetic operations.
**Ans: addition and subtraction because multiplication is a form of addition and division is a form of subtraction.**

**Problem 10**: Given that a and b are numbers, if the following are true , what is the value of a?

b + a =b

a - b = -b

b x a = 0

b/a is undefined.
**Ans 10: a = 0. **

Peter Oye Sagay