IXL | Add and subtract numbers written in scientific notation

Add. Write your answer in scientific notation.

(

2.39

)

(

5.04

)

8.04

7.43

8.04

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question

Add. Write your answer in scientific notation.

(

2.4

)

(

4.87

)

5.11

7.27

key idea

A number written in scientific notation has two factors multiplied together. The first factor must be 1 or more, and it must be less than 10. The second factor must be a power of 10.

solution

Look at the powers of 10 in each number.

(

2.4

)

(

4.87

)

Both numbers have the same power of 10, so you can add them using the distributive property.

(

2.4

)

(

4.87

)

(

2.4

4.87

)

7.27

Looking for more? Try these:

Lesson: Adding and subtracting numbers in scientific notation

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Teacher tools

Work it out

Not feeling ready yet? These can help:

D.1Convert between standard and scientific notation

C.9Multiply powers: integer bases

D.1Add and subtract decimals

Lesson: Adding and subtracting numbers in scientific notation

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