Real Numbers

Which number is irrational?

• 9.6

• √45

• 3/8

• 3.4 x 10 ⁵

Which number is a rational number ?

• 1/4

• π

• √3

• ∛25

Lucy estimated that it would take 4,000 grains of sand to make a pound. That would mean that each grain of sand weighs 1/4000 of a pound. In decimal form, that weight would be 0.00025 of a pound. Express this in scientific notation?

• 2.5 × 10^–4 pounds

• 4 × 10^–3 pounds

• 2.5 × 10^–3 pounds

• 2.5 × 10^–5 pounds

Tags

CCSS.8.EE.A.3

Robert and Dora need to write 4,300,000,000 using scientific notation. Robert claims that 4,300,000,000 = 4.3 x 10⁸ and Dora claims that 4,300,000,000 = 4.3 x 10⁹. Whose number is correct and why?

• Robert’s number is correct because when converting 4,300,000,000, the decimal would be located between the 4 and the 3, and the original decimal point in the standard form moves to the left 8 places.

• Robert’s number is correct because when converting 4,300,000,000, the decimal would be located between the 4 and the 3, and the power of 10 is determined by the number of zeros.

• Dora’s number is correct because when converting 4,300,000,000, the decimal would be located between the 4 and the 3, and the original decimal point in the standard form moves to the left 9 places.

• Dora’s number is correct because when converting 4,300,000,000, the decimal would be located between the 4 and the 3, and the power of 10 is always the number of zeros plus 1.

Tags

CCSS.8.EE.A.3

Write the following numbers in ascending order.

• –2 3/8, –8/6, –0.85, 0.8, 4/3 , 1 2/5

• –8/6, –0.85, 0.8, 4/3 , 1 2/5, –2 3/8

• –2 3/8, 1 2/5, 4/3 , 0.8, –0.85, –8/6

• 1 2/5, 4/3 , 0.8, –0.85, –8/6, –2 3/8

Tags

CCSS.6.NS.C.7A

CCSS.6.NS.C.7B

List the numbers in order from GREATEST to LEAST?

• 
• 
• 
• 

Tags

CCSS.8.NS.A.2

Which of the following could be the missing value?

• √26

• √29

• √35

• √40

A repeating decimal or decimal that terminates is called a 

• Natural Number

• Irrational Number

• Rational Number

• Whole Number

Tags

CCSS.7.NS.A.2D

CCSS.8.NS.A.1

Is √2 Irrational?

• Yes

• No

Tags

CCSS.8.NS.A.1