Beat Summer Math Slide: Rounding Numbers

We all know that visits to the library are an easy way to combat summer reading slide.  Keeping math skills from sliding requires a little more effort.  I’ve taught many grades, and I can say that one skill most students haven’t mastered is ROUNDING!

Every grade I’ve taught has tackled rounding early in the school year.  I think it’s supposed to be quick-and-easy review.  Well, it isn’t.  It’s a math grade killer.

If a National Board Certified Teacher is constantly surprised that kids struggle with rounding, how is a parent supposed to know?  I really don’t see how you would, so this blog post serves as a public service announcement for Rounding Awareness.

Even now, having developed many ways to teach this skill, I still don’t understand what’s so hard about rounding.  I mean, take 53.  Is it closer to 50 or 60?  Closer to 50.  How hard is that?  Very, for most students.  Don’t get them started on rounding 50,453 to the nearest tens place.  They just fall apart.

As a parent, it really helps if you’re mindful of teaching rounding in daily life.


  1. This gum costs 63 cents.  Is that closer to 60 or 70 cents?
  2. I want to buy 5 drinks at the fast food restaurant.  They’re each $1.19.  Is $1.19 closer to $1 or $2?  About how much will I spend?
  3. This recipe calls for 1 2/3 cup of flour.  Is that closer to one cup or two?
  4. Look, this movie made $83 million at the box office over the weekend.  What a blockbuster!  Is 83 closer to 80 or 90?
  5. This meal costs $5.85.  Is $5.85 closer to $5 or $6?

A few rounding worksheets would be really helpful.  I recommend you print them from the rounding section on Dad’s Worksheets and/or  The worksheets help with something incidental real-world rounding doesn’t address: taking the same number and rounding it to the nearest tens, hundreds or thousands place.  For that skill, it really helps kids to see the number in black and white.

Your child can practice rounding on computer games.  Click here for a site with some fun games.  They are all good; my students love Rounding Sharks.

A visual technique for teaching rounding: The Rounding Hill.  As an example of rounding to the nearest 10,  this diagram shows why you round up when the ones digit is 5 or more.  Many kids think that 5 could go either way because they mistakenly believe 5 is exactly in the middle.  The Rounding Hill shows that there is no middle number, as there are 5 numbers on either side of the hill.  The Rounding Hill really helps most students, and I often see them drawing this diagram on their math tests to serve as a reference point.

Posted in Math,Tips for Parents by Corey Green @ Jul 24, 2017


Beat Summer Math Slide: Estimating

Students experience summer slide in every subject.  Here are some fun tips for helping your child with a difficult topic: estimating.

By estimating, I mean two different skills.  One is estimating measurements.  The other is using rounding to estimate an answer to a problem.  (526 +375 = about 900 if you round to the nearest hundred)

Fun with a tape measure*:  Simply give your kids a tape measure and challenge them to hone their estimating skills.  About how long is your kitchen?  How far to the sidewalk?  Is the length of your driveway closer to 10, 20 or 100 feet?  Should you measure the height of your cat in inches, feet or yards?  This is a pleasant way to spend a summer afternoon.

If your kids and their friends are enterprising, they could each make up their own challenges, writing little worksheets with measuring tasks.  It’s like playing school, but more active.

Fun with a scale: This is a lot like Fun with a Tape Measure, but with measurements of weight.  Your child can develop a sense of what things weigh.  How much does cereal weigh?  Dishes?  The family dog?  A book?

Shopping estimation: Running errands really does provide lots of ways to incorporate math.  Simply ask little word problems as you go.  If I buy this item for $2.95 and that item for $4.25, about how much will I spend?  Once your child is good at answering this type of question, challenge her to figure the rough amount of change from a nice round figure like $10.

*Fun with whatever—a tongue-in-cheek way to make any task fun.  Sort of.  It helps!   Read the blog post for classroom examples.

Posted in Academics,Math,Tips for Parents by Corey Green @ Jul 17, 2017


The Second of July: “the most memorable epoch in the history of America”

I always imagine John Adams as the nerdy know-it-all of the Founding Fathers, the guy who was never quite cool*. Nothing illustrates this so well as his earnest prediction that July 2nd was gonna be a big day:

“The second day of July, 1776, will be the most memorable epoch in the history of America. I am apt to believe that it will be celebrated by succeeding generations as the great anniversary festival. It ought to be commemorated as the day of deliverance, by solemn acts of devotion to God Almighty. It ought to be solemnized with pomp and parade, with shows, games, sports, guns, bells, bonfires, and illuminations, from one end of this continent to the other, from this time forward forever more.”— July 3, 1776 letter to Abigail

Americans celebrate the date on the document, not the date the resolution was approved in a closed session of Congress. We all know that we’ll be partying on the Fourth. Let’s take the Second to do our homework and learn a little about the holiday.

Because the Census Bureau is all about the fun: peruse their Fun Facts about the Fourth of July. I liked their comparison of who will be celebrating in the USA: over 311 million now versus 2.5 million then. Also, did you know that more than 1 in 4 hot dogs consumed on the Fourth of July originated from Iowa?

View the Declaration of Independence from the Archives web site.

Read John Adams’ letter describing the 1777 Fourth of July celebration.

That treasure trove of Internet research, Wikipedia, publishes a useful Fourth of July page.

*My basis for this assumption: the “Sit Down, John!” number from the musical 1776 . This is such a fun movie. I get a kick out of watching Gwyneth’s mom as Martha Jefferson. There are powerful moments, too. The best is “Molasses to Rum to Slaves.” (Note: according to an Amazon review, this song is not in the director’s cut DVD.)

Posted in Academics,Holidays,Social Studies by Corey Green @ Jul 2, 2017