Sarah found that the product of 49 and 805 is 3,165.how would finding an estimate her know that the answer is not reasonable

If we round the two values (49 and 805) to numbers more easily worked with and use this product as an estimate we can see 3 165 is much to small

If we round 49 to 50 and 805 to 800 and observe the product of these two values we see an estimate of 40 000

This number is vastly larger than 3 165 so therefore the estimate shows that her answer is not reasonable