A good answer might be:


Adding a Fifth Row

The arrangement of the pins for Ten Pins is at right. 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.

Row 5 will have 5 pins in it.

(Click the image to see the added row.)



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

10 + Pins in Row 5 = ___________