This lesson develops measuring with inches, feet, and centimeters while using rulers, tape measures, and yardsticks. *(Most appropriate for grade levels K-2.)*

__Lesson Time__: 90 minutes

__Student Activity 1__: This activity gives each group a 1-inch block to use as they compare it to items they find in the classroom, as they move around looking for items that would be “about 1 inch long”.

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Student Activity 2 and 3__: After discussing the sides of a ruler, and seeing the difference between inches and centimeters, students will work with a partner to measure several specific items and recording the measurement in inches and centimeters.

__Student Activity 4__: This activity has students working with their partners to identify items that would be measured in inches, centimeters, feet, and yards.

__Group work__: Students will work in groups of 2-3 students. In order to save time, teachers are asked to create the groups before our Wizard arrives.

__Math Standards__:

*K.MD.2**: Directly compare two objects with a measurable attribute in common to see which object has “more of” or “less of” the attribute and describe the difference.*

*1.MD.1**: Order three objects by length; compare the lengths of two objects indirectly by using a third object.*

*1.MD.2**: Express the length of an object as a whole number of length units by laying multiple copies of a shorter object (the length unit) end to end; understand that the length measurement of an object is the number of same-size length units that span it with no gaps or overlaps.*

*2.MD.1**: Measure the length of an object by selecting and using appropriate tools such as rulers, yardsticks, meter sticks, and measuring tapes.*

*2.MD.2**: Measure the length of an object twice, using length units of different lengths for the two measurements; describe how the two measurements relate to the size of the unit chosen.*

*2.MD.3**: Estimate lengths using units of inches, feet, centimeters, and meters.*

*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.*

*2.MD.9**: Generate measurement data by measuring lengths of several objects to the nearest whole unit or by making repeated measurements of the same object.*