"Less" typically means "minus," thus calling for subtraction. As an example, "Forty less twenty nine" might be read 40-29.
"Less than," by contrast, might also be read "smaller than." In other words, if a problem were to ask for a number less than9, a possible solution would be any number smaller in amount than 9 (the numbers 1 through 8 for example).
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7 less than a number is an algebraic expression. Given the number the expression can be evaluated. 7 is less than a number is a statement in the form of an inequality. It is true for some values of the number and not for others.
the symbol for less than is "<" while the symbol for less than or equal to is "<" with "_" underneath it.
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