Next up in Algebra 1 is “Number Sense”–I pushed hard for this one, and we have around three weeks. As I talked with a coworker today, he pointed out that much of number sense can’t exactly be taught–a point I only partially agree with.

 estimating with large numbers to provide reasonable approximations;
 judging the degree of precision appropriate to a situation;
 solving reallife problems involving percentages and decimal portions;
 rounding (understanding reasons for rounding large numbers and limitations in comparisons);
 choosing measurement units to make sense for a given situation;
 comparing physical measurements within and between the U.S. and metric systems; and
 comparing degrees Fahrenheit and Celsius in reallife situations.^{[10]}
All good points, if technically stated.
I’d call number sense being able to understand relative size and equivalency of numbers, estimate both individual quantities and combinations (like products and sums) and locate numbers on a number line. I know I’m missing a lot here, and I plan on refining that definition a lot (notice something? Let me know in the comments!).
That’s all good, but I need to determine how that translates to the classroom. I talk a lot about fractions below, and have a lot more to say about them, but have been really pressed for time. I worked with my elementary school teacher/math specialist sister to develop a lot of what I did, including rethinking my OWN understanding of fractions, and I’m really excited for where my other class goes with this.
One thing for sure: I want to use Estimation 180 throughout this unit, hopefully daily (discovered through Infinite Sums).
Here’s my very workinprogress plan (these are topics; some might be several in a day, others might take multiple days):
 Prime Factorization
 Place value (naming place values, building numbers, identifying place value of a specific digit and vv, naming numbers correctly)
 Powers of 10 and equivalent forms (x 10, x 0.001 etc)–we will use the Pyramids again here
 The Fraction Screener (to give me an idea where my students are)
 Folding Fraction Strips & Defining Unit Fractions
 Modeling fractions using fractions strips and number lines
 Comparing fractions & summarizing comparison rules
 Locating fractions on a number line and representing fractions several ways
 Fraction equivalency (Stuck on: how to prove two fractions are equivalent)
 Ordering fractions, then locating them on a number line, including a gallery walk style group placement activity
 Adding, Subtracting, Multiplying and Dividing fractions (maybe. I teach 9th grade. My kids have seen this over and over and over–I don’t want to repeat the stuff they’ve already seen/heard/done, so I’m only doing this if I really think I can add value)
 The ONE (using pattern blocks to determine the whole for different size partitions
 Converting between fractions and decimals (use a calculator? I’m not sure I see too much value in having them convert to /10, /100, /1000 but I’m open to the idea)
 Equivalent numbers and expressions (both 3/6 & 2/4 and 4+7 = 2*61)
 Basic probability (relating it to fractions too, since who doesn’t like beating a dead horse)
 Ordering decimals and large numbers on a # line (including a great world populations number line activity)
 Distance on a number line (and scale? Will this help prepare for graphing?)
 Order objects (the online game I found here via Infinite Sums)
This is where the order falls apart a little bit…
 Classifying Numbers
 Properties of real numbers
 Perfect squares
 Benchmark values (along the lines of estimation 180, the average could reasonably be which value,
 Other number systems, like Mayan and Egyptian (honestly, because this will be on a test I have to give at the end of the quarter)
 Perimeter and area; frequency tables (not even number sense. Just on dumb test.)
Overall ideas: Does this make sense? About how much would I expect this to be? That’s really the point of number sense, isn’t it? To understand how much it is, without going through a bunch of rules, especially rules that we understand only as rules and not as concepts. The one thing I don’t want to do is rehash the same old same old they’ve already seen year after year and never quite understood.
What does Number Sense mean to you? What am I missing? Any ideas?
Be able to put anything on a number line:
a) Big numbers
b) small numbers
c) fractions
d) decimals
e) radicals (fraction linear interpolation? between?)
Recognizing that most numbers are not neat numbers
infinitely nonrepeating decimals
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