Find the total numbers with 2 digits and 1 digit, and also add them.
Answer (1)
20th Mar, 2023
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Numbers with 2 digits: \begin{aligned} &=99-10\\ &=89+1\\ &=90 \end{aligned}
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Numbers with 1 digits: \begin{aligned} &=9-1\\ &=8+1\\ &=9 \end{aligned}
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Ninety |
Nine |
On adding them, we get:
\begin{aligned}
&=90+9\\
&=99
\end{aligned}
Ninety nine
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