Rational Number Properties and Simplification

MathematicsRational NumbersEasySTEM

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11. Find $a$, if $a$ is a rational number and $a imes a = a$.

12. Name two rational numbers that are their own reciprocals.

13. Simplify the following and express the result in standard form.

(a) $(-36) imes igg( rac{-35}{76}igg) imes igg( rac{19}{15}igg) imes igg( rac{3}{-2}igg)^{-1}$

(b) $ rac{-4}{7} imes igg( rac{-18}{11}igg) imes igg( rac{44}{9}igg)$

Animated Video Solution

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Step by Step Written Solution

1
Step 1

In this problem, we need to simplify a product of four rational numbers and express the result in standard form.

Simplify and express in standard form

2
Step 2

Let's write down the expression from part a. We have negative thirty-six times negative thirty-five over seventy-six, times nineteen over fifteen, times three over negative two raised to the power of negative one.

$$(-36) \times \left(\frac{-35}{76}\right) \times \left(\frac{19}{15}\right) \times \left(\frac{3}{-2}\right)^{-1}$$$
3
Step 3

First, let's deal with the term that has a negative exponent. Recall that a fraction raised to the power of negative one is simply its reciprocal.

$$x^{-1} = \frac{1}{x$$
4
Step 4

So, three over negative two raised to the power of negative one becomes negative two over three.

5
Step 5

Now, let's multiply these terms together. We can combine them into a single fraction. For the signs, we have three negative signs, so the product will be negative.

6
Step 6

Next, let's look for common factors to simplify before multiplying. Notice that seventy-six is equal to four times nineteen.

$$76 = 4 \times 19$$
7
Step 7

We can cancel out the factor of nineteen from the numerator and the denominator.

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About This Question

Subject
Mathematics
Topic
Rational Numbers
Difficulty
Easy
Exam
STEM
Question Type
Open Ended

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