Directions

When you start an Add Up puzzle you will see 15 squares arranged in the shape of a triangle or pyramid
Some of the squares are empty and some of the squares have a number.
You must enter a number in each empty square.
To enter a number, click on a square and then enter a number
The number you enter must be the sum of the numbers in the two squares below it.
To erase a number, click on the number and then press the "Delete" or "Backspace" key
To erase all of the numbers that you have entered, click "Start Over"
To check your answers, click on "Solution" at the bottom of each puzzle.