Thinking Summary · 1
MasteredVisual Logic: 0 of 1 parts shaded.
[Discovery] Shade 4/10 on a fraction bar, then add 5/10 more by shading additional parts.
1
Active StepWelcome to "Pizza Slice Combiner", a 4th Grade Addfractions mission at the Explorer (core) level, staged in our bakery scenario. The mission opens with a hands-on prompt: "Shade 4/10 on a fraction bar, then add 5/10 more by shading additional parts." You'll work with the numbers 4, 10, 5 and arrive at a final answer of 0 across 3 guided steps.
Behind the bakery story, this lesson is really about addfractions aligned to CCSS 4.NF.B.3. Add and subtract fractions with like denominators, including mixed numbers, by joining and separating parts referring to the same whole. The key strategy this mission asks you to internalise: Top: 4 + 5, bottom unchanged.
A general pattern to watch for in 4th Grade addfractions — illustrated with example numbers below, which may differ from this lesson's: Adding both numerators AND denominators (2/8 + 3/8 = 5/16). Denominators name the slice size — they don't add. Only the numerators (the count) add. If you get stuck on "Pizza Slice Combiner", the adaptive Socratic hints below escalate from a gentle nudge to a worked-out strategy — the same way a one-on-one tutor would coach you through it.
Grade 4 · Addfractions
Mission Progress
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Thinking Summary · 1
MasteredVisual Logic: 0 of 1 parts shaded.
[Discovery] Shade 4/10 on a fraction bar, then add 5/10 more by shading additional parts.
1
Active StepEverything you need to know about the Socratic experience.
Shade 4/10 on a fraction bar, then add 5/10 more by shading additional parts. Hint: Bar has 10 parts. Shade 4, then 5 more (total 9).
If 9/10 is improper (numerator ≥ denominator), how many WHOLES does it contain? If you get stuck, the adaptive hint is: 9 ÷ 10 = 0 r 9.
Explorer missions hit the core abstraction at typical numeric ranges — this is where conceptual mastery is built. Within 4th Grade Addfractions, expect numbers in the corresponding range.
Forgetting to convert mixed numbers before adding. Either add the whole parts and fraction parts separately, or convert both to improper fractions first. Pick one — and stick with it.
Multiplyfractions (Multiplication by a whole is repeated like-fraction addition.). Open /grade-4/multiplyfractions to start that topic's missions.
Yes. Every mission, handbook page, and topic hub is mapped to a specific CCSS code (visible in the page header). The curriculum follows the CCSS coherence map: Grade 1 number sense → Grade 3 multiplicative thinking → Grade 6 ratio reasoning, with each grade building strictly on the prior year's foundations.
C-P-A is the Singapore Math sequence proven to deepen number sense: first manipulate physical objects (Concrete), then draw pictures of them (Pictorial), and only then write equations (Abstract). Inquiry AI structures every mission as exactly these three steps — a manipulative, a picture/grid model, and finally the equation. Skipping straight to symbols is the #1 cause of math anxiety; the platform refuses to do it.