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Ten Pins

Ten Pins

The arrangement of the pins for Ten Pins is at right. Notice how each row has one more pin than the row in front of it. Say that another row of pins were added. How many pins are in that row?

Row 1 has 1 pin.

Row 2 has 2 pins.

Row 3 has 3 pins.

Row 4 has 4 pins.

Row 5 has pins.

Click the image to see the added row.


There are 10 pins total in the first four rows. Row five has 5 pins. How many pins total are there in five rows?

10 + Pins in Row 5   =