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ADDING AND SUBTRACTING NUMBERS IN
SCIENTIFIC NOTATION
REVIEW
1.
Write 64,009,000 in scientific notation.
You must have the same powers of 10.
Add or subtract the factors.
**REMEMBER TO LINE UP THE DECIMALS!**
 Bring down the power of 10.
 Check that your answer is still in scientific
notation. Rewrite if needed.
2.1 × 10−4 + 5.97 × 10−4


2.
3.
Write 3.17 × 10−5 in standard notation.
Order from least to greatest.
3.5 × 104 , 3.87 × 102 , 7.81 × 10−2 , 3.1 × 104
8.31 × 105 − (4.971 × 105 )
When the factor gets BIGGER, the
exponent gets SMALLER.
When the factor gets SMALLER,
the exponent gets BIGGER.
Factor

7.48 × 103 + (9.14 × 102 )
Exponent

Exponent
Factor
WHEN THE POWERS OF 10 DON’T MATCH,
REWRITE THE SMALLER NUMBER.
1
9/13/2016
4.5 × 10−2 − (8.17 × 10−4 )
3.914 × 105 + (6.5 × 108 )
PRACTICE
8.72 × 10−3 − (4.6 × 10−3 )
3.5 × 10−2 + 6.6 × 10−3
2.1 × 10−4 + (9.74 × 10−4 )
2