\(213=200+10+3=2\cdot100+10+3=2\cdot10^2+10^1+3\)
\(421=400+20+1=4\cdot100+2\cdot10+1=4\cdot10^2+2\cdot10^1+1\)
\(2009=2000+9=2\cdot1000+9=2\cdot10^3+9\)
\(abc=a\cdot100+b\cdot10+c=a\cdot10^2+b\cdot10^1+c\)
\(abcde=a\cdot10000+b\cdot1000+c\cdot100+d\cdot10+e=a\cdot10^4+b\cdot10^3+c\cdot10^2+d\cdot10^1+e\)
a﴿ 213 = 200 + 10 + 3 = 2.100 + 10 + 3 = 2.10 2 + 10 1 + 3
b﴿ 421 = 400 + 20 + 1 = 4.100 + 2.10 + 1 = 4.10 2+ 2.10 1 + 1
c﴿ 2009 = 2000 + 9 = 2 . 1000 + 9 = 2.10 3 + 9
d﴿ abc = a.100 + b.10 + c = a.10 2 + b.10 1 + c
e﴿ abcde = a.10000 + b.1000 + c.100 + d.10 + e = a.10 4+ b.10 3+ c.10 2+ d.10 1 + e
\(213=100+100+10+3=10^2+10^2+10^1+3\)
\(421=100+100+100+100+10+10+1=10^2+10^2+10^2+10^2+10^1+10^1+1\)\(2009=1000+1000+9=10^3+10^3+9\)
\(abc=10^2a+10^1b+c\)
\(abcde=10^4a+10^3b+10^2c+10^1d+e\)
