SSAT Upper Level Math : How to find decimal fractions

Study concepts, example questions & explanations for SSAT Upper Level Math

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Example Questions

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Example Question #11 : How To Find Decimal Fractions

Convert  to a fraction. 

Possible Answers:

Correct answer:

Explanation:

Lets try to get these values into whole numbers. To do that, we need to make sure both numerator and denominator are whole numbers and we will look for the number with the most decimal places. This is found in the numerator. To get it into a whole number, we will multiply by  or move the decimal places  to the right. When you do that for the numerator, the same applies for the denominator. The new fraction is . Just reduce the fraction by factoring out a  and the answer is shown. 

Example Question #12 : How To Find Decimal Fractions

What's the answer in decimal form?

Possible Answers:

Correct answer:

Explanation:

Convert each fraction to decimal. We have  and . Add these values. Remember when adding decimals, make sure the decimal places are all lined up. 

Example Question #12 : How To Find Decimal Fractions

Convert  into a simplified fraction. 

Possible Answers:

Correct answer:

Explanation:

Lets place a  under the decimal. We are going to make a fraction. Essentially, it's still the same value. Now, we want a whole number in the numerator and what we do to the numerator is done to the denominator as well. Lets multiply the top by  or move the decimal place  spots to the right. Now we have . This needs to be reduced, so divide by  twice until it can't be reduced any further. The answer should be 

Example Question #13 : How To Find Decimal Fractions

Convert to a fraction. 

Possible Answers:

Correct answer:

Explanation:

First, lets convert the exponent into a fraction. Any negative exponent means it's the reciprocal of the positive exponent. So  means . Now lets multiply it with the . This means  or  or .

Example Question #14 : How To Find Decimal Fractions

Convert  into a fraction. 

Possible Answers:

Correct answer:

Explanation:

Let  be .  

Lets multiply  by . Now we have:

 

Lets subtract this equation with the first one and we get:

 We do this because we want to get rid of the repeating decimals and now we have a simple equation, isolate  and we arrive at the final answer. 

Example Question #15 : How To Find Decimal Fractions

Convert  into a fraction.

Possible Answers:

Correct answer:

Explanation:

Let  be  

Lets multiply  by . I chose , because there is a set of  numbers that make the repeating decimal. To determine the value to multiply the repeating decimal, we do  to the power of number in a set before it repeats.

Now we have:

 

Lets subtract this equation with the first one and we get:

 We do this because we want to get rid of the repeating decimals and now we have a simple equation, isolate  and we arrive at the final answer. 

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