Question

a bag of pennies weighs 5.1 kilograms. each penny weighs 2.5 grams. which of these is the best estimate for the number of pennies in the bag? (1 kilogram = 1000 grams) 20 200 2000 20000

Explanation:

Step1: Convert kilograms to grams

We know that 1 kilogram = 1000 grams, so 5.1 kilograms is $5.1\times1000 = 5100$ grams.

Step2: Estimate the number of pennies

To find the number of pennies, we divide the total weight of the bag (in grams) by the weight of each penny. We can approximate 5100 grams as 5000 grams and 2.5 grams as 2.5 grams. Then the number of pennies is approximately $\frac{5000}{2.5}=2000$.

Answer:

2000