These questions test your verbal reasoning skills. This includes your testing vocabulary, a logical approach, your ability to determine patterns within words and your ability to manipulate words.
Try the following suggestions for likely ways that the middle number is made from the outside numbers.AddSubtractMultiplyDivideDouble first number add second numberAdd both numbers then doubleSubtract then doubleMultiply then doubleDivide then doubleAdd both numbers then add any other numberMultiply then subtract any numberDivide then add any numberAdd then halfSubtract then halfMultiply then halfMultiply then multiply by any number
Be sure to check that your chosen method works with both the example numbers, AND that your calculated answer exists in the answers.