10000+10000+10000+10000+10000+10000+10000+10000+10000+10000
= 10000 x 10
= 100000
10000 + 10000 + 10000 + 10000 + 10000 +10000 + 10000 + 10000 + 10000 + 10000
= 10000 x 10
= 100000
10000 + 10000+10000+10000+10000+10000+10000+10000+10000+10000
= 10000 nhân10
=100000
111111111111111111111+1111111111111111111111111111111111
10000x10000x10000x10000x10000x10000x10000x10000x10000x10000
=10000x10
=1000000
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