If you would like to talk about this further at home you could weigh different items in the house, or take your child shopping and show them how much a bag of apples weighs and costs or you could do some cooking at home and talk about the different measurements of the ingredients.
This week we learned that
500grams is the same as saying half a kilogram
1000grams is the same as saying one kilogram
1 cm is smaller than one metre.
100cm is the same as saying one metre.