Grade 1

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Grade 1 covers Geometry, Measurement and Data, Number and Operations in Base Ten, and Operations and Algebraic Thinking. The year centers on place value through 120, addition and subtraction within 20, and telling time to the half-hour. Geometry work focuses on composing shapes and partitioning figures into equal shares.

1.GGeometry (G)1.MDMeasurement and Data (MD)1.NBTNumber and Operations in Base Ten (NBT)1.OAOperations and Algebraic Thinking (OA)
Example Problems
John and Lauren are looking for a good neighborhood to raise their children. They want neighbors who have kids and who are fellow rollerbladers as well. The couple surveys a random sample of residents in a nice-looking neighborhood. Their results are shown below.

Lena rollerblades every morning. Omar does not have children. Zoe is an artist, but that's all we know.

Calculate the following
probability based on the frequency table below.

KidsNo kidsRow total
Rollerblader41950
Not a rollerblader3912
Column total441862


Probability that Lena has kids = ?

Write your answer as a percent.
Solve the equation:
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