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Pyramids

With „Pyramids“ you can practice addition [ + ] and subtraction [ – ] operations in the range from 0 to 1000.

A „Pyramid“ is built out of bricks. There are numbers painted on those bricks. Each brick's number is the sum of the two numbers under it (see images below).

Pyramid_1

Pyramid_2

Pyramid_3

4 + 3 = 7

3 + 7 = 10

7 + 10 = 17

Solving pyramids (Mode 4)

Pyramid_4

In the picture above we wrote letters instead of numbers into the bricks. As you can see, the top brick is always the result of the sum of a, c and double of b.

If we have a pyramid, where only a, c and the top brick are known, then we can calculate b as follows:

  1. Subtract a and c from the top brick.
  2. Divide the result by two to get b.

A real example:

Pyrammid_4

  1. Subtract a and c from the top brick:
    20 – 6 – 4 = 10

  2. Divide the result by two to get b:
    10 : 2 = 5
    So: b = 5

  3. Now the pyramid can be solved as usual.

Pyrammid_6



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