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Imagine a matchstick. 4 rows of matchsticks : 1st row - 1 stick; 2nd row - 4 sticks making a square; 3rd row - 7 sticks making two joined squares; 4th row - 10 sticks making 3 joined squares
How many more are needed to make a square?
How many more need adding to make yet another square along side it?
Carry on adding more squares ...
How many matches have you added?
How many matches are there when you have made 10 squares in the row?
20 squares? 50 squares?