Your task is to place the digits 1-4 [in the pile] into each of the four empty squares so that each of the FOUR sums in the grid are correct.
Drag and drop 3 of the 4 numbers in the pile into the spaces in the grid.
You can rearrange the order of the NUMBERS at any time.
*Take care however,!!! when you drag the last number into the grid it becomes FROZEN.
To restart the activity just refresh the page.