What happens when you multiply a minus by a minus?
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What happens when you multiply a minus by a minus?
When you multiply two negative numbers or two positive numbers then the product is always positive.
What happens when you multiply a plus by a minus?
Multiplication and Division If two positive numbers are multiplied together or divided, the answer is positive. If two negative numbers are multiplied together or divided, the answer is positive. If a positive and a negative number are multiplied or divided, the answer is negative.
What’s the rule for plus and minus?
The Rules:
| Rule | Example | |
|---|---|---|
| +(+) | Two like signs become a positive sign | 3+(+2) = 3 + 2 = 5 |
| −(−) | 6−(−3) = 6 + 3 = 9 | |
| +(−) | Two unlike signs become a negative sign | 7+(−2) = 7 − 2 = 5 |
| −(+) | 8−(+2) = 8 − 2 = 6 |
What are the four rules of maths?
The four rules of mathematics are adding, subtracting, multiplying and dividing.
What is the difference between plus/minus and minus plus?
(mathematics) the symbol ∓, meaning “minus or plus”, used alongside the plus-minus sign to show that a negative value is to be taken where the positive value is indicated by the plus-minus sign, and vice versa (as in (x ± 1) / (x ∓ 2), which means (x + 1) / (x – 2) and (x – 1) / (x + 2)).
What does positive plus negative equal?
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 the rule of addition and multiplication?
To know the correct answer, one must know the correct order of operations with respect to addition, subtraction, multiplication, division, etc. Rule 20: Multiplication and division must be completed before addition and subtraction. 2 + 3 x 7 = 2 + 21 = 23 is the correct answer to the above question.
Who found zero?
“Zero and its operation are first defined by [Hindu astronomer and mathematician] Brahmagupta in 628,” said Gobets. He developed a symbol for zero: a dot underneath numbers.
Do you plus or multiply first?
Order of operations tells you to perform multiplication and division first, working from left to right, before doing addition and subtraction. Continue to perform multiplication and division from left to right.