A. One of the division of numbers is the division of numbers into rational and irrational numbers.

Rational numbers are divided into whole numbers and fractions.

Integers are all numbers whose values are integers, not fractions; …., -2, -1, 0, 1, 2, …., consisting of Whole numbers are natural numbers plus zero (0) zero (0) natural numbers (positive integers) Composite numbers: months other than 1 and not includes prime numbers.Prime numbers: natural numbers that are only divisible by 1 and the number itself.Even numbers: numbers that are divisible by 2 and can be expressed by 2n.Odd numbers: numbers that are not divisible by 2 and can be expressed by 2n -1.Negative integer

B. If you're new to Excel for the web, you'll quickly discover that it's more than just a grid where you enter numbers in columns or rows. Yes, you can use Excel for the web to find totals for a column or row of numbers, but you can also calculate mortgage payments, solve math or engineering problems, or find best-case scenarios based on the variable numbers you plugged in.

Excel for the web does this by using formulas in cells. Formulas perform calculations or other actions on the data in your worksheet. Formulas always start with an equals sign (=), which can be followed by numbers, mathematical operators (like a plus or minus sign), and functions, which can really extend the power of formulas.

For example, the following formula multiplies 2 by 3 and then adds 5 to the product to give the answer, 11.

=2*3+5

The following formula uses the PMT function to calculate the mortgage payment ($1,073.64), based on a 5 percent interest rate (5% divided by 12 months equals the monthly interest rate) over 30 years (360 months) for a $200,000 loan:

=PMT(0.05/12.360.200000)

Here are some additional examples that you can include in the worksheet.

=A1+A2+A3     Adds the values in cells A1, A2, and A3.=SQRT(A1)     Uses the SQRT function to get the square root value in A1. =TODAY()    Returns the current date.=UPPER(“hello”)    Converts text "hello" becomes "HELLO" using the worksheet function UPPER.=IF(A1>0)     Tests cell A1 to see if cell A1 contains a value greater than 0.