Max has 8 children and each of his children has the same number of children as he does except for 2 who have 5 children each. How many grandchildren does he have?
Out of his 8 children, 2 have only 5 children so the rest who have 8 ( the same number as him) are 8-2 = 
<gadget id="calculator">8-2</gadget>
<output>6</output>
6
6 of Max's children have 8 children each for a total of 6*8 = 
<gadget id="calculator">6*8</gadget>
<output>48</output>
48 grandchildren
2 of Max's children have 5 children each for a total of 5*2 = 
<gadget id="calculator">5*2</gadget>
<output>10</output>
10 grandchildren.
In total he has 48+10 = 
<gadget id="calculator">48+10</gadget>
<output>58</output>
58 grandchildren.

<result>58</result>