How much would 4 million quarters weigh?

The mass of a new US quarter dollar is 5.67 grams = 0.00567 x 10^-3 kg .

The mass of a million of them is (10^6) x (0.00567 x 10^-3 kg) = 5.67 kg .

On Earth, the weight of 5.67 kg is about 55.6 newtons, or almost exactly 12.5 pounds .