Division of integers is the opposite operation of multiplying integers It is the process by which one is trying to determine how many times a number is contained into another.
Say for instance you do 42 ÷ 6
You are trying to find out how many times 6 is contained into 42
Since 6 × 7 = 42, 6 is contained into 42 seven times
Thus, 42 ÷ 6 = 7
Notice that
quotient × divisor = dividend
dividend ÷ divisor = quotient
dividend ÷ quotient = divisor
In other words, the product of 4 × 5 = 20
Then, dividing the product, which is 20 by 4 gives you back 5
However, dividing the product(20) by 5 gives you back 4
We can use this fact to find the rule for dividing integers
2 × 6 = 12
12 ÷ 6 = 2
12, 6, and 2 are positive, so
Positive ÷ Positive = Positive
2 × -6 = -12
-12 ÷ -6 = 2
12 and 6 are negative, but 2 is positive, so
Negative ÷ Negative = Positive
In the previous example, notice that -12 ÷ 2 = -6
12 is negative, 2 is positive, but 6 is negative, so
Negative ÷ Positive = Negative
Finally, consider:
-2 × - 6 = 12
12 ÷ -2 = -6
12 is positive, 2 is negative, and 6 is negative, so
Positive ÷ Negative = Negative
Notice also that the rule for division of integers is the same for multiplying integers.Therefore, if you remember the rule for multiplying integers, you already know it for division.
The division of two integers with the same signs is positive
The division of two integers with different signs is Negative
Jul 03, 20 09:51 AM
factoring trinomials (ax^2 + bx + c ) when a is equal to 1 is the goal of this lesson.
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