# How a Nerd Walks Up the Stairs

Your steps should be in a cycle: short, long, long. Long in this case means a double step. Thus, you will cover five stairs in one short-long-long cycle. In addition, you should always start the first cycle on the same foot. Suppose you start on the left foot, then after two cycles you are back on the left foot, having covered ten stairs. While you are walking the stairs in this way, it is clear where you are in the cycle. By the end of the staircase, you will know the number of stairs modulo ten. Usually there are not a lot of stairs in a staircase, so you can easily estimate the total if you know the last digit of that number.

## Notes:

**Folksonomies:** mathematics hacking computational thinking

**Taxonomies:**

/sports/walking (0.535450)

/science/mathematics/arithmetic (0.472681)

/home and garden/bed and bath/bedroom (0.462754)

**Keywords:**

stairs (0.971608 (:0.000000)), left foot (0.838853 (:0.000000)), cycle (0.691994 (:0.000000)), double step (0.629677 (:0.000000)), short-long-long cycle (0.546636 (:0.000000)), staircase (0.448929 (:0.000000)), number (0.372218 (:0.000000)), Nerd (0.343888 (:0.000000)), steps (0.324122 (:0.000000)), digit (0.318320 (:0.000000)), addition (0.311603 (:0.000000)), cycles (0.308139 (:0.000000)), case (0.304702 (:0.000000)), way (0.294563 (:0.000000))

**Concepts:**

Real number (0.939458): dbpedia_resource

Long (0.808748): dbpedia_resource

My Chemical Romance (0.770341): dbpedia_resource

**A Nerd’s Way to Walk Up the Stairs**

**Electronic/World Wide Web>**

**Blog:**Khovanova, Tanya (8th June 2011)

*, A Nerd’s Way to Walk Up the Stairs*, Retrieved on 2018-10-31

**Folksonomies:**hacker computational thinking