Five story problems that put 3rd grade unit fractions into food, craft, and garden settings. Maya slices a personal pizza into 4 equal pieces, Caleb snaps a 6-section chocolate bar, Sofia colors 5 of 8 folded paper parts with polka dots, and Mr. Chen plants 2 of 3 garden sections. The last problem shows Jordan's cornbread cut into four visibly unequal pieces and asks whether his 1/4 claim holds. Every answer in the key names the fraction and the reasoning.
3.NF.1
“Understand a fraction 1/b as the quantity formed by 1 part when a whole is partitioned into b equal parts; understand a fraction a/b as the quantity formed by a parts of size 1/b.”
All five problems: unit fractions in questions 1 and 2, the 5/8 and 3/8 pair in question 3, the 2/3 choice in question 4, and the equal-parts requirement Jordan violates in question 5.
Students name the unit fraction for one slice of Maya's 4-slice pizza, then work out what Caleb gave away (2/6) and kept (4/6) from his 6-section chocolate bar.
Sofia's paper strip is folded into 8 equal parts with 5 colored; students write both the polka-dot fraction and its complement. Mr. Chen's 3-section bed follows as a checkbox question (1/3, 2/3, 3/3, or 3/2) with an explanation line that must use the words equal parts.
A photo-style image shows Jordan's pan cut into four crooked, unequal pieces. Students must reject his claim that one piece is 1/4 and say why equal parts matter.
Application day
Set it the day after naming fractions from shapes. The same 1/b thinking now has to survive inside a story, which is where it usually wobbles.
Vocabulary enforcement
Question 4 requires the phrase equal parts in the explanation. Hold the line on that wording; it is the exact idea question 5 then tests from the other side.
Discussion starter
Project the crooked cornbread image and vote on Jordan's claim before anyone writes. The unequal pieces are obvious enough that the argument builds itself.
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