Thinking Summary · 1
MasteredVisual Logic: 0 of 1 parts shaded.
[Discovery] There were 6 satellites. Shade the 3 that were recalled — the unshaded parts are what remains.
1
Active StepWelcome to "Fuel Leak Stopper", a 1st Grade Subtraction mission at the Seedling (entry-level) level, staged in our space exploration scenario. The mission opens with a hands-on prompt: "There were 6 satellites. Shade the 3 that were recalled — the unshaded parts are what remains." You'll work with the numbers 6, 3 and arrive at a final answer of 3 across 3 guided steps.
Behind the space exploration story, this lesson is really about subtraction aligned to CCSS 1.OA.A.1. Understanding subtraction as taking from, taking apart, and comparing — within 20. The key strategy this mission asks you to internalise: Start at 6, count back 3.
A general pattern to watch for in 1st Grade subtraction — illustrated with example numbers below, which may differ from this lesson's: Mixing up the order: writing 2 − 5 instead of 5 − 2. In Grade 1, subtraction is NOT commutative. The bigger number goes first. If you get stuck on "Fuel Leak Stopper", 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 1 · Subtraction
Mission Progress
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Thinking Summary · 1
MasteredVisual Logic: 0 of 1 parts shaded.
[Discovery] There were 6 satellites. Shade the 3 that were recalled — the unshaded parts are what remains.
1
Active Step1st Grade Subtraction seedling-2 representative practice page for students who need a crawlable, worked entry point into the topic without exposing every near-duplicate long-tail mission.
This seedling · gentle warm-up mission uses a fraction bar to move from the story to a precise subtraction idea. Work through the prompts in order: notice the structure first, name the quantities, then check whether the final answer fits the original situation.
In 1st Grade Subtraction, students need to connect the story, the model, and the symbolic answer. The core move here is: Start at 6, count back 3. A useful check is to ask whether the answer avoids this pitfall: Forgetting subtraction is the undo of addition. Play fact-family games: give 3+2=5 and ask for the matching subtraction facts.
Everything you need to know about the Socratic experience.
There were 6 satellites. Shade the 3 that were recalled — the unshaded parts are what remains. Hint: Tap + until the bar has 6 parts, then tap 3 of them to mark them as recalled.
You know 3 + 3 = 6. So what is 6 − 3? If you get stuck, the adaptive hint is: One fact-family, three equations.
Seedling missions anchor the visual model with small, friendly numbers — ideal as the first attempt at this topic. Within 1st Grade Subtraction, expect numbers in the corresponding range.
Forgetting subtraction is the undo of addition. Play fact-family games: give 3+2=5 and ask for the matching subtraction facts.
Comparing (Subtraction answers "how many more".). Open /grade-1/comparing to start that topic's missions.
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.
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.