Write decimals

Write in the decimal system the short and advanced form of these numbers:
a) four thousand seventy-nine
b) five hundred and one thousand six hundred and ten
c) nine million twenty-six

Correct result:

a =  4079
b =  501610
c =  9000026

Solution:

$a=4\cdot 1000+7\cdot 10+9\cdot 1=4079$

$b=5\cdot 100000+1\cdot 1000+6\cdot 100+1\cdot 10=501610$

$c=9\cdot 1000000+2\cdot 10+6\cdot 1=9000026$

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