Visual Estimation is finding a value that is close enough to the right answer.
- You are not trying to get the exact right answer
- What you want is something that is good enough (usually in a hurry)
Example: How many objects are here:
You could count them, but what if you don't need an exact answer, just one that is close enough? Can you guess well?
As well as looking, you should also be thinking.
Example: If the small box has an area of "1" what is the area of the big box?:
Try "measuring by eye" the width and height, then multiplying ... what do you come up with?
Answer: About 7×4 = 28
Estimating Counts, Lengths and More
It is a very useful skill to be able to estimate how many things you can see, or how long something is or how big something is, and so on.
- How much wrapping paper do you need to wrap a large box?
- How much bread do you need to make sandwiches for all your friends?
- How many people in the room?
- How thick should you make each slice of cake at a party?
- How much paint do you need to paint a wall, or table?
Being good at this takes practice and experience.
So we have made some Estimation Games to help you get started!