Unit 7

Time, Shapes, and Fractions as Equal Parts of Shapes

Grade 2

Math

Unit Length and Description:

15 days

Students finish Grade 2 by describing and analyzing shapes in terms of their sides and angles. In Unit 7, students investigate, describe, and reason about the composition and decomposition of shapes to form other shapes. Students will tell and write time from the analog and digital clocks to the nearest five minutes.

Standards:

 Additional Cluster: MD – Measurement and Data Work with time and money.1 2.MD.7 Tell and write time from analog and digital clocks to the nearest five minutes, using a.m. and p.m. Additional Cluster: MD – Measurement and Data Reason with shapes and their attributes.[1] 2.G.1 Recognize and draw shapes having specified attributes, such as a given number of angles or a given number of equal faces.  Identify triangles, quadrilaterals, pentagons, hexagons, and cubes.  (Sizes are compared directly or visually, not compared by measuring.) 2.G.3 Partition circles and rectangles into two, three, or four equal shares, describe the shares using the words halves, thirds, half of, a third of, etc., and describe the whole as two halves, three thirds, four fourths.  Recognize that equal shares of identical wholes need not have the same shape. Standards for Mathematical Practice: Should be evident in every lesson. MP.1   Make sense of problems and persevere in solving them.  MP.3   Construct viable arguments and critique the reasoning of others.  MP.6   Attend to precision MP.7   Look for and make use of structure. Instructional Outcomes   2.MD.7: Tell and write time from analog and digital clocks to the nearest five minutes, using a.m. and p.m. ·        I can tell time using analog clocks to the nearest 5 minutes. ·        I can tell time using digital clocks to the nearest 5 minutes. ·        I can write time using analog clocks and digital clocks to the nearest 5 minutes. ·        I can identify and label when a.m. and p.m. occur. ·        I can determine what time is represented on an analog clock to the nearest 5 minutes. ·        I can determine what time is represented on a digital clock to the nearest 5 minutes.   2.G.1: Recognize and draw shapes having specified attributes, such as a given number of angles or a given number of equal faces.  Identify triangles, quadrilaterals, pentagons, hexagons, and cubes.  (Sizes are compared directly or visually, not compared by measuring.) ·        I can identify the attributes of 2D and 3D shapes (e.g. faces, angles, sides, vertices, etc.). ·        I can identify 2D and 3D shapes based on the given attributes. ·        I can describe and analyze shapes by examining their attributes (e.g. angles, sides, faces, vertices, etc.). ·        I can compare shapes by their attributes (e.g. faces, angles). ·        I can draw shapes with specified attributes.   2.G.3: Partition circles and rectangles into two, three, or four equal shares, describe the shares using the words halves, thirds, half of, a third of, etc., and describe the whole as two halves, three thirds, four fourths.  Recognize that equal shares of identical wholes need not have the same shape.  ·        I can identify two, three and four equal shares of a whole. ·        I can describe equal shares using vocabulary: halves, thirds, fourths, half of, third of, etc. ·        I can describe the whole as two halves, three thirds, or four fourths. ·        I can justify why equal shares of identical wholes need not have the same shape.

Enduring Understandings:

·        Geometric figures can be described.

·        Geometric figures are found in our world.

·        Telling time is an essential life skill.

·        The length of time can be measured using standard units (seconds, minutes, hours, and days).

·        An analog clock can be used to tell time to the nearest five minutes.

·        Fractional parts are equal shares of a whole number, whole object, or a whole set.

·        The more equal sized pieces that form a whole, the smaller the pieces (fraction) will be.

Essential Questions:

·        How do we describe geometric figures?

·        Where can we find geometric figures in the world around us?

·        Is time important? Why?

·        How can we tell if an estimate is reasonable?

·        How do we show an equal part of something?

·        How are numbers used to show fractions?

·        How do use of fractions in everyday life?

·        How do we know how many fractional parts make a whole?