A good answer might be:
Adding a Fifth Row
The arrangement of the pins for Ten Pins is
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 = ___________