Welcome to "Donut Tray Skip", a Grade 2 Skip Counting by 5, 10, 100 mission at the Seedling warm-up level, staged in a bakery scenario. The mission opens with a hands-on prompt: "Start at 50 and skip-count by 10. Place 90 on the number line." Students work with the numbers 50, 10, 90 and reach a final answer of 4 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: 90 + 10 = 100.
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
Mission Progress
0/3
Thinking Summary · 1
Mastered[object Object]
[Discovery] Start at 50 and skip-count by 10. Place 90 on the number line.
1
Active StepPlace the marker on 90.
Everything you need to know about the Socratic experience.
Start at 50 and skip-count by 10. Place 90 on the number line. Hint: Each tick is +10. Count: 50, 60, 70, …
How many jumps of 10 are needed to go from 50 to 90? If you get stuck, the adaptive hint is: (90 − 50) ÷ 10 = 4.
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.
Place Value to 1000 (Skip counting by 100 makes the hundreds column tangible.) Open /grade-2/placevalue 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.
