Pi-interest.celebrates pi, the number that is 3.14 to two decimal places. March 14, is extra auspicious this year since it is the once-in-a-century Rounded Up Pi Day, when the month, day and year are pi correct to four decimal places rounded up to the nearest decimal place. Pi is 3.14159 to five decimal places. Rounded up to four it is 3.1416. S it be be 100 more years before we see 3/14/16 again.
Math Coachs Corner: Models for Decimal Place Value. Two great models for decimals are blocks and money. Try using money first, because kids are really familiar with it, and then move to blocks, which are a bit more abstract concept.