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# Eighth Grade (Grade 8) Arithmetic and Number Concepts Questions

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Grade 8 Rational and Irrational Numbers
Grade 8 Proportional Relationships
Grade 8 Scientific Notation
Convert 78.9% to a decimal
1. 0.0000789
2. 0.00789
3. 0.789
4. 0.0000000000789
Grade 8 Order of Operations
Grade 8 Order of Operations
Grade 8 Scientific Notation
Grade 8 Scientific Notation
Which of the following numbers is not written in scientific notation?
1. $8.6 xx 10^4$
2. $2.12 xx 10$
3. $22.1 xx 10^(-5)$
4. $9.9132 xx 10^(-1)$
Grade 8 Fractions and Ratios
Which fraction is equivalent to 3.8?
1. $5/18$
2. $19/5$
3. $12/15$
4. $12/5$
Grade 8 Scientific Notation
Convert to scientific notation.

731,000
1. $7.31xx10^5$
2. $7.31xx10^6$
3. $7.31xx10^2$
4. None of the above
Grade 8 Proportional Relationships
Grade 8 Fractions and Ratios
Multiply.

$12/25 * 20/21$
1. $16/ 35$
2. $120/ 425$
3. $10/15$
4. $2/3$
Grade 8 Rational and Irrational Numbers CCSS: 8.NS.A.1
Which of the following can NOT be classified as a rational number?
1. Integers
2. A number that continues on forever with no pattern
3. A square root that has finite decimal places
4. Fractions
Grade 8 Scientific Notation
Convert to scientific notation.

0.00018
1. $1.8xx10^-5$
2. $1.8xx10^-4$
3. $1.8xx10^-9$
4. None of the above
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