Question: What Is The Rule Of Plus Minus?

What is the rule for a negative minus a positive?

Rule 4: Subtracting a negative number from a positive number—when you see the subtraction (minus) sign followed by a negative sign, turn the two signs into a plus sign.

Thus, instead of subtracting a negative, you’re adding a positive, so you have a simple addition problem..

Does minus and minus make a plus?

Adding and multiplying combinations of positive and negative numbers can cause confusion and so care must be taken. Two ‘pluses’ make a plus, two ‘minuses’ make a plus. A plus and a minus make a minus.

What is the quotient of two negative numbers?

RULE 3: The quotient of two negative integers is positive.

Who invented plus and minus signs?

Robert RecordeRobert Recorde, the designer of the equals sign, introduced plus and minus to Britain in 1557 in The Whetstone of Witte: “There be other 2 signes in often use of which the first is made thus + and betokeneth more: the other is thus made – and betokeneth lesse.”

What is minus minus equal to?

Rule 3: Subtracting a negative number from a negative number – a minus sign followed by a negative sign, turns the two signs into a plus sign. So, instead of subtracting a negative, you are adding a positive. Basically, – (-4) becomes +4, and then you add the numbers. For example, say we have the problem -2 – –4.

What is the rule for adding and subtracting positive and negative numbers?

When adding positive numbers, count to the right. When adding negative numbers, count to the left. When subtracting positive numbers, count to the left. When subtracting negative numbers, count to the right.

Why is a negative plus a negative a positive?

When you multiply a negative by a negative you get a positive, because the two negative signs are cancelled out.

What is plus/minus in math?

The plus–minus sign (also, plus or minus sign), ±, is a mathematical symbol with multiple meanings. In mathematics, it generally indicates a choice of exactly two possible values, one of which is obtained through addition and the other through subtraction. … In chemistry, the sign is used to indicate a racemic mixture.

What does the +/- sign mean?

(mathematics) the symbol ±, meaning “plus or minus”, used to indicate the precision of an approximation (as in “The result is 10 ± 0.3”, meaning the result is anywhere in the inclusive range from 9.7 to 10.3), or as a convenient shorthand for a quantity with two possible values of opposing sign and identical magnitude …

Why minus multiplied by minus is plus?

The answer has to do with the fundamental properties of operations on numbers (the notions of “addition”, “subtraction”, “multiplication”, and “division”). … Each number has an “additive inverse” associated to it (a sort of “opposite” number), which when added to the original number gives zero.

Do 2 negatives make a positive?

When you have two negative signs, one turns over, and they add together to make a positive. If you have a positive and a negative, there is one dash left over, and the answer is negative.

What is a negative plus a negative?

When you are adding a negative number to a negative number, it becomes subtraction, where you start from a negative point on the numbers line and move left. For example, -3 + (-2). … You need to ignore the plus sign and recognize that the second negative means you are subtracting that number.

What’s the rule for plus and minus?

The Rules:RuleExample+(+)Two like signs become a positive sign3+(+2) = 3 + 2 = 5−(−)6−(−3) = 6 + 3 = 9+(−)Two unlike signs become a negative sign7+(−2) = 7 − 2 = 5−(+)8−(+2) = 8 − 2 = 62 more rows