2nd grade Instructional Guide

Measurement and Data

Core Guide

Grade 2

Measure and estimate lengths in standard units (Standards 2.MD.1 – 4) Standard 2.MD.4 Measure to determine how much longer one object is than another, expressing the length difference in terms of a standard length unit. For example, after measuring a pencil and a crayon, a student uses the measurements to determine that the pencil is two inches longer than the crayon. Concepts and Skills to Master ● Understand that differences in length can be measured (see Suggested Models below) ● Record the measure of two separate objects ● Compare the length of two separate objects and state which is longer/shorter than the other ● Find the difference in length of two separate objects and calculate the difference in the measurement units (for example, if a pencil is 10 cm and a marker is 8 cm, the marker is 2 cm shorter than the pencil) ● State the difference between the length of two objects in the same units as they were measured (for example, if a pencil and marker are measured in inches, the difference between the two objects will be stated in inches) Related Standards: Current Grade Level Related Standards: Future Grade Levels 2.OA.1 Use addition and subtraction to solve one- and two-step word problems 3.MD.2 Measure and estimate liquid volumes and masses of 2.MD.1 Measure the length of an object objects using standard units of grams, kilograms, milliliters, and 2.MD.2 Measure the length of an object twice, using length units of different lengths liters for the two measurements 3.MD.4 Generate measurement data by measuring lengths using 2.MD.3 Estimate lengths using units of inches, feet, centimeters and meters rulers 2.MD.10 Draw a picture graph and a bar graph to represent a data set with up to four 3.NF.3 Explain equivalence and compare fractions categories. Solve simple comparison problems using information presented in a bar graph Critical Background Knowledge ● Order three objects by length; compare the lengths of two objects indirectly by using a third object (1.MD.1) ● Describe measurable attributes of objects, such as length or weight. Describe several measurable attributes of a single object (K.MD.1) ● Directly compare two objects with a measurable attribute in common, to see which object has “more of”/”less of” the attribute (K.MD.2) Academic Vocabulary inch, foot, yard, yardstick, ruler, centimeter, meter, meter stick, measuring tape, length, customary, metric, measure, unit(s), difference, compare Suggested Models Suggested Strategies ● Express the length of an object as a whole number of length units (1.MD.2) ● Understand the relationship between numbers and quantities (K.CC.4)

● Align two objects side by side and measure the difference between them (see Suggested Models to the left) ● Estimate the difference in length between two objects, then measure to check the accuracy of the estimate ● Measure different objects and use subtraction to find the difference in measurements

A student may lay the pencil and crayon end to end then measure the difference in distance between the tip of the pencil and the tip of the crayon.

2.MD.4

ADA Compliant 1/13/2020