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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.
 
               
                 
                     
                    