Welcome to "Probe Path Jump", a Grade 2 Add/Subtract on a Number Line mission at the Seedling warm-up level, staged in a space scenario. The mission opens with a hands-on prompt: "Start at 8. Make 10 hops of size 1. Place the END on the number line." Students work with the numbers 8, 10, 1 and reach a final answer of 2 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: 8 + 10 = 18.
A common misconception this page surfaces is: Jumping in the wrong direction for subtraction. Plus = right (toward bigger). Minus = left (toward 0). Picture the arrow before the first hop. 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
0/3
Thinking Summary · 1
Mastered[object Object]
[Discovery] Start at 8. Make 10 hops of size 1. Place the END on the number line.
1
Active StepPlace the marker on 18.
Everything you need to know about the Socratic experience.
Start at 8. Make 10 hops of size 1. Place the END on the number line. Hint: Each hop adds +1. From 8, take 10 hops.
Starting from 18, how many MORE hops of size 1 reach 20? If you get stuck, the adaptive hint is: 2 ÷ 1 = 2.
Seedling missions anchor the visual model with small, friendly numbers — ideal as the first attempt at this topic. Within Grade 2 Add/Subtract on a Number Line, expect numbers in the corresponding range.
Jumping in the wrong direction for subtraction. Plus = right (toward bigger). Minus = left (toward 0). Picture the arrow before the first hop.
Add/Subtract within 100 (The number-line view is a second representation of the same arithmetic.) Open /grade-2/addsubwithin100 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.
