article_snippet: Most toddlers are very good at belly aching for sweets and dragging Most toddlers feet on a supermarket trip.
article_snippet: The three-year-old spends Michael McBride time calculating the cost of groceries as Michael McBride marches around the aisles adding up the weekly food basket.
article_snippet: Scroll down for video .
article_snippet: aged 2 years and four months.
highlights_snippet: Youngster adds up the shopping bill and calculates the correct change .
  