Welcome to "Star Map Skip Lab", a Grade 2 Skip Counting by 5, 10, 100 mission at the Seedling warm-up level, staged in a space scenario. The mission opens with a hands-on prompt: "Start at 30 and skip-count by 10. Place 80 on the number line." Students work with the numbers 30, 10, 80 and reach a final answer of 5 across 3 guided steps.
Behind the story, this lesson builds skip counting by 5, 10, 100 understanding aligned to CCSS 2.NBT.A.2. The key strategy is: 80 + 10 = 90.
A common misconception this page surfaces is: Adding 1 instead of the chosen step (e.g. counting by 5 → 5, 6, 7…). State the rule first: "every jump = +5." Then chant the sequence so the rule sticks before the next number. The adaptive Socratic hints move from a small nudge to a fuller strategy, keeping the reasoning visible for students, parents, and teachers.
Grade 2 · Skip Counting by 5, 10, 100
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Thinking Summary · 1
Mastered[object Object]
[Discovery] Start at 30 and skip-count by 10. Place 80 on the number line.
1
Active StepPlace the marker on 80.
Everything you need to know about the Socratic experience.
Start at 30 and skip-count by 10. Place 80 on the number line. Hint: Each tick is +10. Count: 30, 40, 50, …
How many jumps of 10 are needed to go from 30 to 80? If you get stuck, the adaptive hint is: (80 − 30) ÷ 10 = 5.
Seedling missions anchor the visual model with small, friendly numbers — ideal as the first attempt at this topic. Within Grade 2 Skip Counting by 5, 10, 100, expect numbers in the corresponding range.
Adding 1 instead of the chosen step (e.g. counting by 5 → 5, 6, 7…). State the rule first: "every jump = +5." Then chant the sequence so the rule sticks before the next number.
Number Line Add/Sub (Skip-counting hops are the same physical motion as add/sub on a number line.) Open /grade-2/numberlinejump 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.
Research on "productive struggle" shows that 20–60 seconds of focused effort BEFORE help dramatically improves long-term retention — the brain encodes the strategy more deeply. Inquiry AI's hint timing is calibrated to this window: short enough to prevent frustration, long enough to lock in the learning. Parents can adjust the threshold in settings if a learner needs faster scaffolding.
