Estimating means giving your best guess. Use the clues to help you make a really good guess before you actually count the number of objects.
Use the clues given. Look at the number of objects from left to right they are going down by one each time. If there are 5 stars, 4 clubs and 2 ladies then there is likely to be 3 umbrellas.
First estimate and then count the number of umbrellas. Then you must write the correct number.
Answer = 3