The computation shows that the option that is not correct decomposition is A. 2 hundreds, 42 tens, 3 ones
2 hundreds, 42 tens, 3 ones
= 200 + 420 + 3
= 623
6 hundreds, 12 tens, 3 ones
= 600 + 120 + 3
= 723
4 hundreds, 2 tens, 303 ones
= 400 + 20 + 303
= 723
6 hundreds, 2 tens, 103 ones
= 600 + 20 + 103
= 723
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