There are many parts that go into an addition problem. Most often there are numbers, a plus sign, and an equals sign.
The less than sign I believe that you are talking about is the minus/subtraction sign? The addition sign, +, is the opposite of the subtraction sign :)
Because a negative negative is the same a a positive, and because of the definition of subtraction and addition.
You can indicate addition by using it's sign "+" or saying add/plus.
The guy who invented the addition sign
a real life example of an octagon is a stop sign.
A stop sign!
stop sign
a yield sign
A stop sign is an octagon
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the addition sign
In my opinion, your star sign has no effect on your life.
The addition sign was invented in Oakland California.
Nothing at all, because your birth sign, whilst great fun, has no real effect.
The addition sign was first used in 1544.
This can be called * A Plus sign * An Adding sign