Fraction Classroom · 2.0.0 · Student pages

Estimate Before Exact: teaching companion

Use a size bound before computation and reject exact answers that violate it. Student pages include two diagnostic probes, a reteaching check, and the original exit ticket. The teacher copy includes the complete lesson preparation, teaching sequence, diagnostic responses, all original question guides, and updated rubrics.

Anonymous group code: __________   Date: __________

Diagnostic probes

Explain or draw your reasoning. Your teacher will use these responses to choose what to revisit.

d1. Could 1/3 + 1/4 equal 2/7? Reject or accept it using size before finding the exact sum.

d2. Predict whether 5/6 + 7/8 is below or above two, and whether it is near two.

Check after reteaching

Complete this check independently after discussing the model.

r1. A learner says 3/4 + 2/3 = 1/5. Give a fast reason to reject it.

Exit ticket

Complete both original exit questions independently. Use a drawing or explanation when asked.

e1. Calculate 1/3 + 1/4. Show a model or your reasoning.

e2. Give one reason to reject a positive sum smaller than an addend.