Common Core: 6th Grade Math : Expressions & Equations

Study concepts, example questions & explanations for Common Core: 6th Grade Math

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Example Questions

Example Question #51 : Understand What Makes An Equation Or Inequality True And Why: Ccss.Math.Content.6.Ee.B.5

Which value for \(\displaystyle x\) would make the equation below true? 

\(\displaystyle 17=54-x\)

 

Possible Answers:

\(\displaystyle 36\)

\(\displaystyle 38\)

\(\displaystyle 35\)

\(\displaystyle 37\)

\(\displaystyle 39\)

Correct answer:

\(\displaystyle 37\)

Explanation:

We can use substitution to determine the value of \(\displaystyle x\)

\(\displaystyle 54-38=16\)

\(\displaystyle 54-39=15\)

\(\displaystyle 54-35=19\)

\(\displaystyle {\color{Teal} 54-37=17}\)

\(\displaystyle 54-36=18\)

Because we are looking for the number that when subtracted from \(\displaystyle 54\) equals \(\displaystyle 17\), our correct answer is \(\displaystyle 37\)

Example Question #52 : Understand What Makes An Equation Or Inequality True And Why: Ccss.Math.Content.6.Ee.B.5

Which value for \(\displaystyle x\) would make the equation below true? 

\(\displaystyle 4=27-x\)

 

Possible Answers:

\(\displaystyle 23\)

\(\displaystyle 24\)

\(\displaystyle 27\)

\(\displaystyle 25\)

\(\displaystyle 26\)

Correct answer:

\(\displaystyle 23\)

Explanation:

We can use substitution to determine the value of \(\displaystyle x\)

\(\displaystyle 27-27=0\)

\(\displaystyle 27-26=1\)

\(\displaystyle 27-25=2\)

\(\displaystyle {\color{Teal} 27-23=4}\)

\(\displaystyle 27-24=3\)

Because we are looking for the number that when subtracted from \(\displaystyle 27\) equals \(\displaystyle 4\), our correct answer is \(\displaystyle 23\)

Example Question #53 : Understand What Makes An Equation Or Inequality True And Why: Ccss.Math.Content.6.Ee.B.5

Which value for \(\displaystyle x\) would make the equation below true? 

\(\displaystyle 49=99-x\)

 

Possible Answers:

\(\displaystyle 52\)

\(\displaystyle 49\)

\(\displaystyle 50\)

\(\displaystyle 53\)

\(\displaystyle 51\)

Correct answer:

\(\displaystyle 50\)

Explanation:

We can use substitution to determine the value of \(\displaystyle x\)

\(\displaystyle 99-52=47\)

\(\displaystyle 99-53=46\)

\(\displaystyle 99-51=48\)

\(\displaystyle {\color{Teal} 99-50=49}\)

\(\displaystyle 99-49=50\)

Because we are looking for the number that when subtracted from \(\displaystyle 99\) equals \(\displaystyle 49\), our correct answer is \(\displaystyle 50\)

Example Question #54 : Understand What Makes An Equation Or Inequality True And Why: Ccss.Math.Content.6.Ee.B.5

Which value for \(\displaystyle x\) would make the equation below true? 

\(\displaystyle 19=39-x\)

 

Possible Answers:

\(\displaystyle 16\)

\(\displaystyle 18\)

\(\displaystyle 20\)

\(\displaystyle 17\)

\(\displaystyle 19\)

Correct answer:

\(\displaystyle 20\)

Explanation:

We can use substitution to determine the value of \(\displaystyle x\)

\(\displaystyle 39-17=22\)

\(\displaystyle 39-18=21\)

\(\displaystyle 39-19=20\)

\(\displaystyle {\color{Teal} 39-20=19}\)

\(\displaystyle 39-16=23\)

Because we are looking for the number that when subtracted from \(\displaystyle 39\) equals \(\displaystyle 19\), our correct answer is \(\displaystyle 20\)

Example Question #55 : Understand What Makes An Equation Or Inequality True And Why: Ccss.Math.Content.6.Ee.B.5

Which value for \(\displaystyle x\) would make the equation below true? 

\(\displaystyle 32=45-x\)

 

Possible Answers:

\(\displaystyle 11\)

\(\displaystyle 12\)

\(\displaystyle 9\)

\(\displaystyle 10\)

\(\displaystyle 13\)

Correct answer:

\(\displaystyle 13\)

Explanation:

We can use substitution to determine the value of \(\displaystyle x\)

\(\displaystyle 45-9=36\)

\(\displaystyle 45-10=35\)

\(\displaystyle 45-11=34\)

\(\displaystyle 45-12=33\)

\(\displaystyle {\color{Teal} 45-13=32}\)

Because we are looking for the number that when subtracted from \(\displaystyle 45\) equals \(\displaystyle 32\), our correct answer is \(\displaystyle 13\)

Example Question #411 : Expressions & Equations

Which value for \(\displaystyle x\) would make the equation below true? 

\(\displaystyle 28=83-x\)

 

 

Possible Answers:

\(\displaystyle 55\)

\(\displaystyle 58\)

\(\displaystyle 56\)

\(\displaystyle 57\)

\(\displaystyle 59\)

Correct answer:

\(\displaystyle 55\)

Explanation:

We can use substitution to determine the value of \(\displaystyle x\)

\(\displaystyle 83-59=24\)

\(\displaystyle 83-58=25\)

\(\displaystyle 83-57=26\)

\(\displaystyle 83-56=27\)

\(\displaystyle {\color{Teal} 83-55=28}\)

Because we are looking for the number that when subtracted from \(\displaystyle 83\) equals \(\displaystyle 28\), our correct answer is \(\displaystyle 55\)

Example Question #62 : Understand What Makes An Equation Or Inequality True And Why: Ccss.Math.Content.6.Ee.B.5

Which value for \(\displaystyle x\) would make the equation below true? 

\(\displaystyle 27=65-x\)

 

 

Possible Answers:

\(\displaystyle 34\)

\(\displaystyle 36\)

\(\displaystyle 35\)

\(\displaystyle 37\)

\(\displaystyle 38\)

Correct answer:

\(\displaystyle 38\)

Explanation:

We can use substitution to determine the value of \(\displaystyle x\)

\(\displaystyle 65-35=30\)

\(\displaystyle 65-34=31\)

\(\displaystyle 65-36=29\)

\(\displaystyle 65-37=28\)

\(\displaystyle {\color{Teal} 65-38=27}\)

Because we are looking for the number that when subtracted from \(\displaystyle 65\) equals \(\displaystyle 27\), our correct answer is \(\displaystyle 38\)

Example Question #63 : Understand What Makes An Equation Or Inequality True And Why: Ccss.Math.Content.6.Ee.B.5

Which value for \(\displaystyle x\) would make the equation below true? 

\(\displaystyle 50=99-x\)

 

Possible Answers:

\(\displaystyle 50\)

\(\displaystyle 51\)

\(\displaystyle 53\)

\(\displaystyle 52\)

\(\displaystyle 49\)

Correct answer:

\(\displaystyle 49\)

Explanation:

We can use substitution to determine the value of \(\displaystyle x\)

\(\displaystyle 99-52=47\)

\(\displaystyle 99-53=46\)

\(\displaystyle 99-51=48\)

\(\displaystyle 99-50=49\)

\(\displaystyle {\color{Teal} 99-49=50}\)

Because we are looking for the number that when subtracted from \(\displaystyle 99\) equals \(\displaystyle 50\), our correct answer is \(\displaystyle 49\)

Example Question #64 : Understand What Makes An Equation Or Inequality True And Why: Ccss.Math.Content.6.Ee.B.5

Which value for \(\displaystyle x\) would make the equation below true? 

 \(\displaystyle 57=85-x\)

 

 

Possible Answers:

\(\displaystyle 29\)

\(\displaystyle 32\)

\(\displaystyle 28\)

\(\displaystyle 27\)

\(\displaystyle 31\)

Correct answer:

\(\displaystyle 28\)

Explanation:

We can use substitution to determine the value of \(\displaystyle x\)

\(\displaystyle 85-27=58\)

\(\displaystyle 85-31=54\)

\(\displaystyle 85-32=53\)

\(\displaystyle 85-29=56\)

\(\displaystyle {\color{Teal} 85-28=57}\)

Because we are looking for the number that when subtracted from \(\displaystyle 85\) equals \(\displaystyle 57\), our correct answer is \(\displaystyle 28\)

Example Question #65 : Understand What Makes An Equation Or Inequality True And Why: Ccss.Math.Content.6.Ee.B.5

Which value for \(\displaystyle x\) would make the equation below true? 

\(\displaystyle 63=89-x\)

 

Possible Answers:

\(\displaystyle 24\)

\(\displaystyle 27\)

\(\displaystyle 23\)

\(\displaystyle 25\)

\(\displaystyle 26\)

Correct answer:

\(\displaystyle 26\)

Explanation:

We can use substitution to determine the value of \(\displaystyle x\)

\(\displaystyle 89-27=62\)

\(\displaystyle 89-23=66\)

\(\displaystyle 89-24=65\)

\(\displaystyle 89-25=64\)

\(\displaystyle {\color{Teal} 89-26=63}\)

Because we are looking for the number that when subtracted from \(\displaystyle 89\) equals \(\displaystyle 63\), our correct answer is \(\displaystyle 26\)

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