Code: AC9M6N03. Goal: show equivalent fractions and compare 2/3 and 3/4 using one 12-gap line. Prepare: bars/line or spoken gap sequence.
- Launch · 2 min. Ask whether
2/4and1/2need two marks on the same 0–1 line. - Model · 5 min. Place
2/4=1/2=6/12at one mark. Place2/3=8/12and3/4=9/12;3/4 > 2/3by 1/12 of the same whole. Say numerator and denominator both scale by the same factor when making equivalent names. - Guided · 6 min. Match
1/3=4/12,2/4=6/12,3/4=9/12; have learners correct a claim that2/3 > 3/4merely because 3 is greater than 4 in a numerator/denominator comparison. - Choice · 6 min. D17-A/B/C: line explanation, archive-space diagram or original game-state explanation. Require equivalent names and same whole.
- Exit · 4 min. “Which is larger,
2/3or3/4, and by how much?”3/4by1/12. Ask where both sit between 0 and 1. - Note · 2 min. Check whether learner can justify order, not only convert by rote. Recheck with
1/3versus1/2if needed.
Home/extension: Use one folded strip as the whole. Extension: find 3/6 and 6/12 on the same half mark, with equal partitions shown.