To prepare for this activity, give each pair of students an envelope containing three sets of cards. Keep each set of cards (Circles of Evaluation, Verbal Expressions, and Mathematical Expressions) together with rubber bands or paperclips. Each column on this page is one set of the first card type (Circles of Evaluation).

(abs 20)

(abs 20)

(abs 20)

(negate 20)

(negate 20)

(negate 20)

(abs (negate 20))

(abs (negate 20))

(abs (negate 20))

(abs (negate -20))

(abs (negate -20))

(abs (negate -20))

(negate (negate 20))

(negate (negate 20))

(negate (negate 20))

(negate (negate -20))

(negate (negate -20))

(negate (negate -20))

(negate (abs 20))

(negate (abs 20))

(negate (abs 20))

(negate (abs -20))

(negate (abs -20))

(negate (abs -20))

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