Information Display
The information display on a train shows letters by illuminating dots in a rectangular array. What fraction of the dots in this array is illuminated?
Age
11 to 14
Challenge level
Problem
Image
The information display on a train shows letters by illuminating dots in a rectangular 5 x 8 array.
In the letter 't' shown, what fraction of the dots in the array is illuminated?
If you liked this problem, here is an NRICH task which challenges you to use similar mathematical ideas.
Student Solutions
Answer: $\frac12$
There are forty dots in a 5 x 8 array, and twenty of them are illuminated, so the fraction is $\frac12$.