Final answer:
Lenore's estimate of the product of 51 x 37 as 1,500 is reasonable as an estimate but a more accurate rounded estimate would be 2,000, which is closer to the actual product of 1,887.
Step-by-step explanation:
Lenore is using rounding and estimation to determine the approximate product of two numbers, 51 and 37. When rounding these two factors to the nearest ten, 51 rounds to 50 and 37 rounds to 40.
Thus, her estimation would be 50 x 40, which equals 2,000, not 1,500 as Lenore estimated. This can be seen as a reasonable estimate because it gives a quick, simplified version of the multiplication that is relatively close to the actual product, which is 1,887.
However, when comparing Lenore's estimate to the rounded calculation, it is evident that her estimate is low and can be further refined to be more accurate.