Answer
$(1$$\times$$10^{3}$$)+(2$$\times$$10^{2}$$)+(5$$\times$$10^{1}$$)+(4$$\times$$10^{0}$$)$
Work Step by Step
First, write 1254 out as an addition problem based on each digits place value.
For example, 1000+200+50+4
Now, add the powers of 10 rule to the numbers expanded above
$(1$$\times$$10^{3}$$)+(2$$\times$$10^{2}$$)+(5$$\times$$10^{1}$$)+(4$$\times$$10^{0}$$)$
