Our Maths task this year was to find the age of some of the trees in our school grounds.
We were familiar with counting the rings on the inside of a cut trunk, but we didn’t know that we can find the age by measuring.
We enjoyed our practical activity in the beautiful sunshine. We worked in groups to measure a height of 1m on each tree trunk, we then measured the girth of the tree at this point. For some of our trees we had to work out a sensible way of measuring lengths longer than the length of the tape measure!
In our classroom, we had to divide each girth measurement by 2.5. We did this by writing down key facts for multiplying by 2.5:
2.5 x 2 = 5 2.5 x 5 = 12.5 2.5 x 10 = 25.
We then calculated the age of each tree.
We found that the youngest tree we measured was only 2 years old, but the oldest trees were over 130 years! These trees have been alive since before Victoria became Queen in 1836!