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Unit 5, Lesson 9

Partition shapes and identify halves and quarters of circles and rectangles.

EngageNY 60 min(s)

In this lesson, students explore halves and fourths more deeply than in the previous lesson, identifying these parts within circles and rectangles of varying size and dimension. They recognize that as they partition, or decompose, the whole into more equal shares, they create smaller units.

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Other lessons from Unit 5 in Grade 1 by EngageNY

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Unit 5, Lesson 8

Partition shapes and identify halves and quarters of circles and rectangles

60 min(s)

Next Lesson

Unit 5, Lesson 10

Construct a paper clock by partitioning a circle and tell time to the hour.

60 min(s)

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Unit 5, Lesson 7

Name and count shapes as parts of a whole, recognizing relative sizes of the parts.

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Unit 5, Lesson 11

Recognize halves within a circular clock face and tell time to the half hour.

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1 Content Standard is aligned with this lesson

1.G.A.3

Major StandardsSupporting StandardsAdditional Standards

Standard 1.G.A.3

Partition circles and rectangles into two and four equal shares, describe the shares using the words "halves", "fourths", and "quarters", and use the phrases "half of", "fourth of", and "quarter of". Describe the whole as two of, or four of the shares. Understand for these examples that decomposing into more equal shares creates smaller shares.

Part of Additional Cluster 1.G.A

Prerequisites for 1.G.A.3

1st Grade

1.G.A.2

Compose two-dimensional shapes (rectangles, squares, trapezoids, triangles, half-circles, and quarter-circles) or three-dimensional shapes (cubes, right rectangular prisms, right circular cones, and right circular cylinders) to create a composite shape, and compose new shapes from the composite shape.

Upcoming Standards for 1.G.A.3

2nd Grade

2.G.A.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.