'At least' means equal to or greater than. This meaning is not restricted to maths; it is one of the common everyday meanings of the phrase.
So if you have a question which, for example, tells you to calculate the probability of getting at least one head when a coin is flipped twice then it means:
What is the probability of getting one or more heads when a coin is flipped twice.
HL in math mean hypotenuse leg
Sadly, math is commonly expected to be difficult to the point of inscrutable and unconquerable, at least in the US.
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In a math problem, least means smallest.
the average
No, it means average.
The word at means the least
Numerical order, least to greatest.
I think it means Least Common Multiple...
LCM is an abbreviation for "least common multiple."
A hertog is a figure having at least two curved parts.
The least common multiple, or LCM, is the smallest number that all the members of a given set of numbers will divide into evenly with no remainder.
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"At least" is expressed with the "greater or equal" sign, for example, x >= 100. (I don't know how to draw the greater-or-equal sign here - it is a horizontal line beneath the greater sign).