Students learn about the concepts of accuracy and approximation as they pertain to robotics, gain insight into experimental accuracy, and learn how and when to estimate values that they measure. Students also explore sources of error stemming from the robot setup and rounding numbers.

The purpose of this task is to help students interpret signed numbers in a context as a magnitude and a direction and to make sense of the absolute value of a signed number as its magnitude.

This task examines, from a mathematical and statistical point of view, how scientists measure the age of organic materials by measuring the ratio of Carbon 14 to Carbon 12. The focus here is on the statistical nature of such dating. This task addresses a very important issue about precision in reporting and understanding statements in a realistic scientific context.

This task is a refinement of ``Carbon 14 dating'' which focuses on accuracy. Because radioactive decay is an atomic process modeled by the laws of quantum mechanics, it is not possible to know with certainty when half of a given quantity of Carbon 14 atoms will decay. This type of question is very important in science and it also provides an opportunity to study the very subtle question of how errors behave when applying a function: in some cases the errors can be magnified while in others they are lessened.

This problem involves solving a system of algebraic equations from a context: depending how the problem is interpreted, there may be one equation or two.

This task is a somewhat more complicated version of "Accurately weighing pennies I'' as a third equation is needed in order to solve part (a) explicitly. Instead, students have to combine the algebraic techniques with some additional problem-solving (numerical reasoning, informed guess-and-check, etc.)

This short video and interactive assessment activity is designed to teach fourth graders about multi-step addition of weights with compound units (metric units) - word problems.

This short video and interactive assessment activity is designed to teach fourth graders about adding compound units in years and months.

This short video and interactive assessment activity is designed to give fourth graders an overview of weight-based english-unit word problems.

This short video and interactive assessment activity is designed to teach fifth graders about converting integer and fraction sums into decimals.

This short video and interactive assessment activity is designed to give fourth graders an overview of measuring capacity (metric units).

This short video and interactive assessment activity is designed to give fifth graders an overview of measuring capacity (metric units).

This video and accompanying interactive assessment practice was designed to teach overview of addition sums to first graders.

This short video and interactive assessment activity is designed to teach second graders an overview of addition (sums to 100).

This short video and interactive assessment activity is designed to teach fourth graders about solving multi-step weight problems with subtraction (metric units) - word problems.

This short video and interactive assessment activity is designed to teach fourth graders about using a scale and multi-step calculations to find weight in grams i.

This short video and interactive assessment activity is designed to give fifth graders an overview of addition and subtraction in kilograms and grams.

This short video and interactive assessment activity is designed to give fourth graders an overview of weight in metric units.

This short video and interactive assessment activity is designed to teach fourth graders about two-step subtraction of weights (english units) - word problems.

This short video and interactive assessment activity is designed to give fifth graders an overview of addition and subtraction of weights (metric units).