9 tens + 12 ones = 9 × 10 + 12 × 1 = 90 + 12 = 102.
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No. The tens unit is independent of the ones unit
The value of 9 would be hundreds in this question the 4=thousands 9=hundreds 6=tens 2=ones
9 units or 9 ones - which is 9.
If the first digit is 9, you have 9 options (0-8) for the second digit. If the first digit is 8, you have 8 options (0-7) for the second digit. Etc. This leaves you with the arithmetic series: 0 + 1 + 2 + 3 + ... + 9.
I think the answer is 612!1 (tens digit) which is odd is half of 2 (hundreds digit) and the sum is (6+1+2=9).