Welcome to "Bakery Number-Line Hop", a Grade 2 Add/Subtract on a Number Line mission at the Explorer core practice level, staged in a bakery scenario. The mission opens with a hands-on prompt: "Start at 0. Make 11 hops of size 1. Place the END on the number line." Students work with the numbers 0, 11, 1 and reach a final answer of 9 across 3 guided steps.
Behind the story, this lesson builds add/subtract on a number line understanding aligned to CCSS 2.MD.B.6. The key strategy is: 0 + 11 = 11.
A common misconception this page surfaces is: Counting the start point as the first hop. Hops happen BETWEEN points. The starting tick is position 0 of the journey, not a step taken. The adaptive Socratic hints move from a small nudge to a fuller strategy, keeping the reasoning visible for students, parents, and teachers.
Grade 2 · Add/Subtract on a Number Line
Mission Progress
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Thinking Summary · 1
Mastered[object Object]
[Discovery] Start at 0. Make 11 hops of size 1. Place the END on the number line.
1
Active StepPlace the marker on 11.
Everything you need to know about the Socratic experience.
Start at 0. Make 11 hops of size 1. Place the END on the number line. Hint: Each hop adds +1. From 0, take 11 hops.
Starting from 11, how many MORE hops of size 1 reach 20? If you get stuck, the adaptive hint is: 9 ÷ 1 = 9.
Explorer missions hit the core abstraction at typical numeric ranges — this is where conceptual mastery is built. Within Grade 2 Add/Subtract on a Number Line, expect numbers in the corresponding range.
Counting the start point as the first hop. Hops happen BETWEEN points. The starting tick is position 0 of the journey, not a step taken.
Skip Counting (Larger hops are skip-counts.) Open /grade-2/skipcount to start that topic's missions.
Socratic teaching answers a question with a better question. Instead of "the answer is 12", the system asks "if you had 3 groups of 4, how could you skip-count?" The goal is to externalize the learner's reasoning so they hear themselves think. Every Inquiry AI hint follows this pattern: nudge → reframe → analogy → only then a worked example, in that order.
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.
