Ask your child to choose a few kinds of whales. Read about their length and size from here or from any book you like. We like DK eyewitness series “Whale” a lot.
After reading about them
For younger children:
1.Write down the sizes of whales on index cards and let your child order them. For very young children vary the size of the card proportionally to measuring units.
2. Also measure up your child/family etc. Its a good activity to introduce standard measuring units.
3.Think about how many children the size of your child would be needed to equal the size of one whale.
4. Measure a room in your house. Looking at your database of whales decide which whale would fit in the room. How big a room would be needed to fit a sperm whale/blue whale etc.
For older children:
1. Using the data about whales’ sizes, weights etc make graphs. You can make them on paper, or if using a computer you can use MS word, MS excel or try this free interactive website.
My 2nd grader’s graph about the different sizes of whales
My kindergartner’s graph