Squares and triangles

In today’s class we have discovered some very special numbers.

We began by adding consecutive numbers:

1 + 2 = 3
1 + 2 + 3 = 6
1 + 2 + 3 + 4 = 10

We then continued by continuing the series:

1, 3, 6, 10, 15, 21, 28, 36, 45, 55, …

Then we saw we could represent these numbers with triangles:

Then we saw that when we add triangular numbers we get square numbers.

We saw that the first square numbers are 1, 4, 9, 16, 25, …

We also saw that some numbers, 1 and 36 for example, are triangular numbers and square numbers.

Thanks to Nerea and Arnau for their drawings. Fantastic work!Keep sending me your photos!

IMG_4647.jpgIMG_4648.jpg

Thanks also to Valentina for her work!

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