Chapter Closure
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a/b=a * 5/b * 5
a/b=a * 7/b * 7
Multiply
Now that we have a common denominator, we can proceed to simplifying the expression.
Put minus sign in numerator
Add fractions
Add terms
We can see that adding a negative number is the same as subtracting its positive counterpart. Below we will demonstrate by finding - 1.4 and moving 2.3 units to the left on the number line.
These properties tell us the legal
moves we can make when adding or multiplying numbers.
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But why aren't there properties for subtraction or division? |
Some mathematicians refuse to acknowledge that subtraction and division are even operations! Subtraction is the same thing as adding a negative and division is the same thing as multiplying by a fraction. a-b=a+(- b) and a/b=a* 1/b Therefore, we can use the Properties of Real Numbers for subtraction and division, but we need to change our way of thinking.
Now, we let's perform the addition. 0.3+4.29 = 4.59 We can check if this is true by using a calculator.
