Question

Complete the table by finding the sum and the difference of Expression 1 and Expression 2.

Write your answers in scientific notation. Explain your method.

Answer 1

Expression 1 Expression 2 Sum Difference

$3\times {10}^4$ $1\times {10}^4$ $4\times {10}^4$ $2\times {10}^4$

$4\times {10}^{-3}$ $2\times {10}^{-3}$ $6\times {10}^{-3}$ $2\times {10}^{-3}$

$4.1\times {10}^{-7}$ $1.5\times {10}^{-7}$ $5.6\times {10}^{-7}$ $2.6\times {10}^{-7}$

$8.3\times {10}^6$ $1.5\times {10}^6$ $9.8\times {10}^6$ $6.8\times {10}^6$