Recognize and generate simple equivalent fractions, e.g., 1/2 = 2/4, 4/6 = 2/3. Explain why the fractions are equivalent, e.g., by using a visual fraction model.
GRADE 3
CCSS.MATH.CONTENT.3.NF.A.3.B
An angle is measured with reference to a circle with its center at the common endpoint of the rays, by considering the fraction of the circular arc between the points where the two rays intersect the circle. An angle that turns through 1/36
GRADE 4
CCSS.MATH.CONTENT.4.MD.C.5.A
Use parentheses, brackets, or braces in numerical expressions, and evaluate expressions with these symbols.
GRADE 5
CCSS.MATH.CONTENT.5.OA.A.1
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