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Estimate Products

Let's estimate the product 189 × 4.

In order to estimate the product, first, we round the first factor to the nearest hundreds.

 

189 × 4 = ?
↓        
200 × 4 = ?

 

Now, multiply:
 

200 × 4 = 800

 

So, the estimated product is 800.
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Help

The correct answer is

Remember :

The smallest number is the one that comes first while counting.

Solution :

To arrange the given numbers in order from smallest to greatest, find the smallest number among all the given numbers.

21,27,23

21 is the smallest number.