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 You can form a triangle with 21 dots, starting with 6 dots at the bottom, reducing 1 dot as you go higher, till you have just I dot on top.

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Or you can start with 1 dot on top, and keep increasing 1 dot in the next line as you go down.

1. Can you tell how many dots you need to make an 8 - decker triangle with dots?

Try this

Make grids using dots. Then draw funny ﬁgures.

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