# Number Sense Blog

Oct 18, 2012

In the last blog posting I discussed the importance of developing numerical fluency (the ability to effortlessly recall and use basic number facts). Unfortunately, many students in 2nd through 5th grades, and at times even higher, have a limited g...

Oct 18, 2012

The first few times a child looks at addition and subtraction problems can be a confusing experience. It is very important for children to be able to effortlessly recall reliable methods to answer number facts.One excellent method is Filling in th...

Oct 18, 2012

When you add two apples with three apples you get five apples. When you add two bananas with three bananas you get five bananas.When you add two apples and three bananas do you get five banapples?You don't get five banapples just as if you add pe...

### A Flea's Flea - Proportional Thinking

Oct 18, 2012

When my son Nick was seven years old, he told me, "Hey Dad, if the world was the size of a basketball, our house would be as big as a flea's flea!"I was stunned at this incredible display of Proportional Thinking.  While I thought to myself that ...

### Wholes and Parts

Oct 18, 2012

Add 17 + 18 + 19. Do it quick! If you reached for a scratch sheet to get to the solution of 54, you didn't do it wrong, but here's a different way to think about this question:First, round each number to the nearest 10 (20 in this case), and add t...

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