Math 8 Unit 2 Assessment

How do you write
8.317 x 10⁶
in standard form?

• 8, 371, 000

• 83, 170, 000

• 837, 100

• 8, 317, 000

Answer explanation

To write 8.317 x 10^6 in standard form, move the decimal point 6 places to the right, resulting in 8,317,000. Thus, the correct answer is 8,317,000.

Tags

CCSS.6.EE.A.1

Which one of these is in scientific notation?

• 8.987000

• 8.98 x 10⁶

• 80.987 x 10

• 8.98⁶

Answer explanation

The correct choice, 8.98 x 10⁶, is in scientific notation, which expresses numbers as a product of a coefficient and a power of ten. The other options do not follow this format.

Tags

CCSS.6.EE.A.1

Write 9.8 x 10^-5 in standard form

• 0.00098

• 0.000098

• .098

• 98,000

Answer explanation

To convert 9.8 x 10^-5 to standard form, move the decimal point 5 places to the left, resulting in 0.000098. Thus, the correct answer is 0.000098.

Tags

CCSS.6.EE.A.1

Convert 4.56 x 10³ to standard form

• 4560

• 0.00456

• 456

• 45,600

Tags

CCSS.6.EE.A.1

Which of the following in the LARGEST number?

• 9 x 10⁶

• 8 x 10¹⁰

• 1.3 x 10¹²

• 5.3 x 10³

Answer explanation

To compare the numbers, convert them to standard form: 9 x 10^6 = 9,000,000; 8 x 10^10 = 80,000,000,000; 1.3 x 10^12 = 1,300,000,000,000; 5.3 x 10^3 = 5,300. The largest is 1.3 x 10^12.

Tags

CCSS.6.EE.A.1

CCSS.6.EE.A.2

CCSS.6.NS.C.7

Which of the following numbers is the SMALLEST?

• 8.7 x 10³

• 3 x 10⁴

• 1.3 x 10⁸

• 9 x 10²

Answer explanation

To find the smallest number, convert each to standard form: 8.7 x 10^3 = 8700, 3 x 10^4 = 30000, 1.3 x 10^8 = 130000000, and 9 x 10^2 = 900. The smallest is 9 x 10^2, which equals 900.

Tags

CCSS.6.EE.A.1

CCSS.6.NS.C.7

CCSS.6.EE.A.4

4x + 7 = 23

• x = 16

• x = 4

• x = 9

• x = 12

Answer explanation

To solve for x, subtract 7 from both sides: 4x = 16. Then, divide by 4: x = 4. Thus, the correct answer is x = 4.

Tags

CCSS.7.EE.B.4A

3c + 5 = 23

• c = 3

• c = 6

• c = 7

• c = 18

Answer explanation

To solve for c, subtract 5 from both sides: 3c = 18. Then, divide by 3: c = 6. Thus, the correct answer is c = 6.

Tags

CCSS.7.EE.B.4A

7 + ^a⁄₃ = 5

• a= -2

• a= -6

• a= 3

• a= 15

Answer explanation

To solve for a, subtract 7 from both sides: a/3 = 5 - 7, which simplifies to a/3 = -2. Multiply both sides by 3 to get a = -6. Thus, the correct answer is a = -6.

Tags

CCSS.7.EE.B.4A

Solve the equation for x:
2x + 3x + 4 = 44

• x = 8

• x = 9

• x = 10

• x = 11

Answer explanation

Combine like terms: 2x + 3x = 5x. The equation becomes 5x + 4 = 44. Subtract 4 from both sides: 5x = 40. Divide by 5: x = 8. Thus, the correct answer is x = 8.

Tags

CCSS.8.EE.C.7B