Filling a container

In your book, Maths Mela (Chapter 8), we fill bigger containers with a small measure. A dosing cup (the little cup that comes with medicine) holds 10 ml. How many dosing cups fill a 100 ml bottle? Count in tens: 10, 20, 30 … 100. That is 10 cups.

A 250 ml glass needs 25 dosing cups, because 25 tens make 250. A 500 ml vessel needs 50 cups, and a 1 l bottle (1000 ml) needs 100 cups. A dropper holds just 1 ml, so 10 droppers fill a 10 ml dosing cup.

Mr Krishna packs perfumed oils. Four customers each want 1 l of oil, in different sizes of bottle. Remember, 1 l = 1000 ml. Ms Shetty wants 500 ml bottles: she gets 2. Mr Muthukumar wants 200 ml bottles: 200, 400, 600, 800, 1000, so he gets 5.

Ms Naini wants 100 ml bottles: she gets 10. Ms Kannan wants 50 ml bottles. Two 50 ml bottles make 100 ml, so she gets twice as many as Ms Naini: 20 bottles. The smaller the bottle, the more bottles we need.