Words for +
Addition (noun), add (verb), and , plus, more than, altogether, sum, total
Words for -
Subtraction (noun), subtract (verb), less than, take away, minus, difference between
Words for x
Multiplication (noun), multiply (verb), times, lots of, product of, of (as in what is half of 2)
Words for division /
Division (noun), divide (verb), share, share by, into, remainder