Question

Elena wants to add

2.3 · 105 + 3.6 · 106 and writes
that it will be equal to 5.9 · 106
Explain to Elena what her mistake was
and what the correct solution is.

Answer 1

623.1

Explanation:

Elena wants to add the following numbers together

2.3 .105 + 3.6. 106

She writes the sum for these digits is 5.9. 106

The correct solution is

2.3 .105 + 3.6. 106

241.5 + 381.6

= 623.1

Hence the correct answer is 623.1