Consider this situation.
Gina wants to buy two shirts. One costs $3.50 and the other costs $1.80.
Let's find the total money that Gina spent on the shirts.
To find the total money that Gina will spend on shirts,
first, write the amounts to be added one under the other, with the decimal points lined up.
So, Gina will spend $5.30 in total on the shirts.
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The correct answer is
The smallest number is the one that comes first while counting.
To arrange the given numbers in order from smallest to greatest, find the smallest number among all the given numbers.
21 is the smallest number.