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From above and from the side

You learn what you see of a block building when you look at it straight from above or from the side.

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How to work it out

  1. From above you see every square with something on it, once.
  2. From the side you only see the tallest stack in each row; the rest is behind it.
  3. Count the squares you can see.

You look straight down from above. How many squares do you see?

  1. From above you only see the top block of each stack.
  2. So every square with something on it counts once.
  3. Count the squares with a number on the plan: that is the answer.
More examples

You look at the side. How many squares do you see?

  1. In each row you only see the tallest stack.
  2. Add those heights together.

A row with stacks of 1, 3 and 2, one behind the other, seen from the side.

You only see the tallest: 3 squares high.