Observation challenges – odd one out & spot the differences

A set of 40 observation challenges which require students (or adults!) to study images carefully. There are twenty sets of three pictures -work out which is the odd one out- and twenty sets of two pictures to spot the differences between.
They are suitable for use in a variety of settings -such as cover tasks, time fillers or in tutor time. They are provided both on power point and in word document format.