8th grade milestones review 2.4

A carpenter bought 750 nails. Each nail has a mass of 5.2 x 10^-3 kilogram. What is the total mass, in kilograms, of the nails the carpenter bought? Give your answer as a decimal.

• 3.9

• 0.39

• 3.90

• 0.039

Tags

CCSS.8.EE.A.4

Peter determined the area, in square miles, of a piece of land using his calculator. The result of his calculation is displayed on his calculator in scientific notation as 7.4e-4. Which statement is true of the area of the piece of land?

• It is between 0.07 and 0.7 square mile.

• It is between 0.007 and 0.07 square mile.

• It is between 0.0007 and 0.007 square mile.

• It is between 0.00007 and 0.0007 square mile.

Tags

CCSS.8.EE.A.3

A light year is defined as the distance light travels in one year. One light year is 9.46 x 10^12 kilometers. A galaxy is about 150,000 light years wide. About how many kilometers wide is the galaxy?

• 1.419 x 10^16

• 1.419 x 10^17

• 1.419 x 10^18

• 1.419 x 10^19

Tags

CCSS.8.EE.A.4

What is the value of the expression below? (4.8 x 10^3) / (1.2 x 10^4) x (2.2 x 10^-6)

• 0.88

• 0.088

• 0.0088

• 0.00088

Tags

CCSS.8.EE.A.4

The mass of a dust particle is approximately 7.5 x 10^-10 kilograms and the mass of an electron is 9.1 x 10^-31 kilograms. Approximately how many electrons have the same mass as one dust particle?

• 1.21 x 10^20

• 1.21 x 10^21

• 8.24 x 10^20

• 8.24 x 10^21

Tags

CCSS.8.EE.A.4

Which of the following equations are true? Select all that apply.

• B, C

• A, C, E

• B, D, E

• C, D, E

Tags

CCSS.8.EE.A.4

Which expression is equivalent to (4.5 x 10^2) + (6.0 x 10^3) and written in scientific notation?

• 1.05 x 10^6

• 2.7 x 10^6

• 6.45 x 10^3

• 10.5 x 10^1

Tags

CCSS.8.EE.A.4

What is the value of the expression shown below? 1.6 x 10^5 --------- 0.2 x 10^2

• 0.8 x 10^3

• 8 x 10^3

• 0.8 x 10^7

• 8 x 10^7

Tags

CCSS.8.EE.A.4

About how much rice does the United States consume each year?

• 42 x 10^11 grams

• 3 x 10^8 grams

• 14,000 grams

• 4.2 x 10^12 grams

Tags

CCSS.8.EE.A.3

About how much rice does Brazil consume each year?

• 10 x 10^11 grams

• 1 x 10^13 grams

• 10 x 10^12 grams

• 1 x 10^12 grams

Tags

CCSS.8.EE.A.4