2. These numbers can
be arranged to
look like squares:
1, 4, 9, 16, 25, 36,
49, 64, 81, 100, …
3. A curious property
appears when we
subtract a squared
number from its
successor :
4 – 1 = 3
9 – 4 = 5
16 – 9 = 7
25 – 16 = 9, …
The drawing shows you
why!
4. These numbers can
be arranged to look
like triangles:
1, 3, 6, 10, 15, 21,
28, 36, 45, 55, …
5. A curious property
appears when we add
two successive
trianghular numbers:
the result is always a
squared number!
1 + 3 = 4
3 + 6 = 9
6 + 10 = 16
10 + 15 = 25, …
6. A curious property
appears when we add
two successive
trianghular numbers:
the result is always a
squared number!
1 + 3 = 4
3 + 6 = 9
6 + 10 = 16
10 + 15 = 25, …
