adding and subtracting numbers in scientific notation

Subtract using scientific notation. 
(2 x 10³) - (1.9 x 10²)

• 1.81 x 10⁵
• 1.81 x 10³
• 1.81 x 10⁶
• 1.81 x 10⁴

(2.9 x 10^-9) - (1.7 x 10^-9)

• 1.2 x 10^-18
• 1.2 x 10^-9
• 4.6 x 10^-9
• 1.335 x 10^-4

Add withing scientific notation 
(5.2 x 10⁷) + (3.01 x 10⁴)

• 5.20301 x 10¹¹
• .520301 x 10⁷
• 5.20301 x 10⁷
• 5.20301 x 10⁸

Tags

CCSS.8.EE.A.4

Write the answer in scientific notation.
4.1 x 10⁵ +   5.5 x 10⁶  =

• 5.91 x 10⁶
• 9.6 x 10⁵
• 9.6 x 10¹¹
• 4.65 x 10⁵

  When adding or subtracting in scientific notation, what needs to be the same before you add or subtract the front constants or coefficients?

• Coefficients
• Factors
• Exponents
• None of these

Tags

CCSS.HSN.RN.A.2

(6 × 10⁶) - (9.9 × 10⁴)

• 59 × 10⁶
• 5.901 × 10⁶
• -4 × 10²
• None of these

Find the combined mass of Earth and Venus. Earth is approximately 5.9 x 10²⁴ kg and Venus is approximately 4.9 x 10²² kg.

• Add
• Subtract
• Multiply
• Divide

Tags

CCSS.6.NS.B.3

The population of Cherokee County is 5.6 x 10³. The population of Cedar Bluff is 1.3 x 10². How many more people are there in Cherokee County than Cedar Bluff?

• 57.4 x 10³
• 5047
• 5,470
• 5.47

Tags

CCSS.6.EE.A.1

CCSS.6.EE.B.7

CCSS.6.NS.B.3

¨In 2010, USA had 2.31 x10⁵ iPhone users. That same year, Europe had 1.49 x 10⁴ iPhone users. How many iPhone users did the USA and Europe have combined? 

• 3.8 x 10⁵
• 2.08 x 10⁵
• 1.55 x 10¹
• None of these

Tags

CCSS.6.EE.A.1

CCSS.6.NS.B.3

The distance between Memphis and San Francisco is 1.2 x 10³ miles. The distance between Memphis and Nashville is 2.5 x 10². How much further is San Francisco from Memphis than Nashville is from Memphis? 

• 9.5 x 10²
• 4.8 x 10⁰
• 1.450 x 10³
• 1.3 x 10³

Tags

CCSS.6.EE.A.1

CCSS.6.EE.A.3

CCSS.6.NS.B.3

CCSS.6.NS.C.7