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What is a historical event that happened in 1489 in math?
plus and minus signs were invented
What century were plus and minus signs in math first used?
the 16th century, specifically 1544.
Is decrease in math is minus or plus?
In math decrease means minus and increase means plus
Why is minus into minus a plus?
Because both minus signs to be cut therefore minus * minus will be treated as plus numbers
Do two plus signs make a minus?
In addition and subtraction, if the plus sign is larger than the minus sign, then it's a plus. For example: +10 minus -20 = -10 If the plus sign is smaller than the minus sign, the answer will be a minus. For example: -10 minus + 20 = -10 In multiplication, if you have 2 plus signs, the answer will be a plus sign. If you have 2 minus signs, the answer will be a plus sign then, too. But if you have a plus and a minus sign, then the answer will be a minus. For example: +5 x + 2 = +10 -5 x - 2 = +10 -5 x +2 = -10
