What fraction in its lowest term is 800g of 1kg?

To find the fraction in its lowest terms for 800g of 1kg, we need to convert both quantities to the same unit. Since 1kg is equal to 1000g, we can rewrite 800g as 800/1000 or 4/5 when simplified. Therefore, the fraction in its lowest terms for 800g of 1kg is 4/5.