HiSET - Addition and subtraction

You can solve this problem in several ways. One way is to convert each number out of scientific notation and write it out fully, then find the sum of the two values and convert the answer back into scientific notation.

$1.26\times10^6+2.4\times10^4 ewline = 1,260,000+24,000 ewline = 1,284,000 ewline = 1.284\times10^6$

Another, potentially faster, way to solve this problem is to convert one answer into the same scientific-notational terms as the other and then sum them.

$1.26\times10^6+2.4\times10^4$

$2.4\times10^{4}=0.024\times10^{6}$

$1.26\times10^6+0.024\times10^6=(1.26+0.024)\times10^6=1.284\times10^6$

Addition and subtraction

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