Problem
4 x 10
^{3}
+ 2 x 10
^{2}
= _____
Procedure
Rewrite one of the terms so that the exponents are equal.
4 x 10
^{3}
= 40 x 10
^{2}
Complete the addition
40 x 10
^{2}
+ 2 x 10
^{2}
= 42 x 10
^{2}
Solution
4 x 10
^{3}
+ 2 x 10
^{2}
= 42 x 10
^{2}
or 4.2 x 10
^{3}
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