The value of adding 7 × 10⁻⁶ and 2.1 × 10⁻⁵ is 2.8 × 10⁻⁵. The correct option is last option 2.8 x 10^−5
Addition of Numbers
From the question, we are to add the given numbers
The numbers are
7 × 10⁻⁶ and
2.1 × 10⁻⁵
Write 7 × 10⁻⁶ such that it has a exponent of 10⁻⁵
7 × 10⁻⁶ is the same as 0.7 × 10⁻⁵
∴ 7 × 10⁻⁶ = 0.7 × 10⁻⁵
Now adding 0.7 × 10⁻⁵ and 2.1 × 10⁻⁵, we get
2.1 × 10⁻⁵
+ 0.7 × 10⁻⁵
= 2.8 × 10⁻⁵
Hence, the value of adding 7 × 10⁻⁶ and 2.1 × 10⁻⁵ is 2.8 × 10⁻⁵. The correct option is last option 2.8 x 10^−5
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