25 questions / Total Unknown Second Part Unknown First Part Unknown Put Together/Take Apart: Both Addends Unknown Put Together/Take Apart: 1 Addend Unknown
25 questions / Find the answer Find the missing number Find the beginning number Put Together/Take Apart: Both Addends Unknown Put Together/Take Apart: 1 Addend Unknown
25 questions / Result Unknown Change Unknown Start Unknown Put Together/Take Apart: Both Addends Unknown Put Together/Take Apart: 1 Addend Unknown