Create your own centimeter ruler. Then, estimate and measure with lengths with it. Warm up with a Mystery Math Mistake as you add two 2-digit numbers using a decomposition strategy. Think through ...

Quick: How many people did you see on the way home from work the other day? Was it more or less than the day before? Regardless of your answer, it's likely you can't explain what led you to it. Number ...

THE question of “Personal Equation in the Tabulation of Thermograms,” &c., which was recently considered in this journal, is but a portion of the general subject of the estimation of fractions, and ...

Fractions are the basis for most higher-level mathematics. Students need to master the numerical values in earlier grades to tackle topics like algebra later. There’s only one hitch: Fractions can ...

Many children never master fractions. When asked whether 12/13 + 7/8 was closest to 1, 2, 19, or 21, only 24% of a nationally representative sample of more than 20,000 US 8th graders answered ...