Waste less time on Facebook — follow Brilliant.

An intutive way to think about odd and even numbers and about divisibility.

Think of indivisible bricks, and houses:



You can cut the first house into two equal parts. But you're not strong enough to cut the second house into two equal part, since you'd be left with one brick.

For divisibility, build houses with bases containing \(m\) bricks. Then the total number of full floors is the quotient of the total number of bricks, divided by \(m\). And the remainder is the number of bricks in the floor where they aren't complete. Example with \(9\) divided by \(4\):

enter image description here

enter image description here

A number \(m\) divides a number \(t\) if and only if you can build a house with \(t\) bricks with a base made of \(m\) bricks and without having any incomplete floor.

Note by حكيم الفيلسوف الضائع
2 years, 5 months ago

No vote yet
1 vote


Sort by:

Top Newest

follow me Omar Nader · 2 years, 2 months ago

Log in to reply


Problem Loading...

Note Loading...

Set Loading...