Welcome to "Satellite Dozen Adder", a 1st Grade Tensadd mission at the Challenger (stretch) level, staged in our space exploration scenario. The mission opens with a hands-on prompt: "First batch: 6 shuttles of 10 cadets (60 cadets). Second batch: 4 more shuttles of 10 (40 cadets). Build BOTH batches as ten-bundles." You'll work with the numbers 6, 10, 60 and arrive at a final answer of 110 across 3 guided steps.
Behind the space exploration story, this lesson is really about tensadd aligned to CCSS 1.NBT.C.4. Add multiples of 10 within 100 — when you add tens, the ones digit never changes. The key strategy this mission asks you to internalise: Adding tens is just like adding ones — but each unit is worth 10.
A general pattern to watch for in 1st Grade tensadd — illustrated with example numbers below, which may differ from this lesson's: Adding 30 + 40 by counting all 70 ones individually. Treat the ten-bundles as countable objects in their own right. Skip-count by 10s, not by 1s. If you get stuck on "Satellite Dozen Adder", 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 · Tensadd
Mission Progress
0/3
Thinking Summary · 1
Mastered[object Object]
[Discovery] First batch: 6 shuttles of 10 cadets (60 cadets). Second batch: 4 more shuttles of 10 (40 cadets). Build BOTH batches as ten-bundles.
1
Active StepDistribute items equally among groups
Everything you need to know about the Socratic experience.
First batch: 6 shuttles of 10 cadets (60 cadets). Second batch: 4 more shuttles of 10 (40 cadets). Build BOTH batches as ten-bundles. Hint: Tap "+ Add Group" 10 times. Each group gets exactly 10.
One more bundle of 10 cadets arrives. What is the new total now? If you get stuck, the adaptive hint is: 100 + 10 = ?
Challenger missions push beyond CCSS expectations with edge cases that surface deeper misconceptions. Within 1st Grade Tensadd, expect numbers in the corresponding range.
Changing the ones digit when adding tens (e.g., 23 + 10 = 34). Adding 10 only changes the tens digit. The ones stay put. Show with base-10 blocks.
Addition (Same join-and-count logic, scaled up to ten-bundles.). Open /grade-1/addition 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.
Pure discovery is inefficient — kids hit a wall and quit. Guided Discovery scaffolds the path: a careful sequence of questions, models, and adaptive hints leads the learner toward the insight without revealing it. Inquiry AI's hint system fires automatically after ~15s of hesitation or on the first mistake, escalating from a Socratic nudge to a worked example only when needed. Mistakes are diagnosed via "misconception keys" so the hint matches the actual wrong-thinking pattern.
