Welcome to "Satellite Dozen Adder", a 1st Grade Tensadd mission at the Seedling (entry-level) level, staged in our space exploration scenario. The mission opens with a hands-on prompt: "First batch: 2 shuttles of 10 cadets (20 cadets). Second batch: 3 more shuttles of 10 (30 cadets). Build BOTH batches as ten-bundles." You'll work with the numbers 2, 10, 20 and arrive at a final answer of 60 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: 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. 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
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Thinking Summary · 1
Mastered[object Object]
[Discovery] First batch: 2 shuttles of 10 cadets (20 cadets). Second batch: 3 more shuttles of 10 (30 cadets). Build BOTH batches as ten-bundles.
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Active StepDistribute items equally among groups
Everything you need to know about the Socratic experience.
First batch: 2 shuttles of 10 cadets (20 cadets). Second batch: 3 more shuttles of 10 (30 cadets). Build BOTH batches as ten-bundles. Hint: Tap "+ Add Group" 5 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: 50 + 10 = ?
Seedling missions anchor the visual model with small, friendly numbers — ideal as the first attempt at this topic. Within 1st Grade Tensadd, expect numbers in the corresponding range.
Forgetting the trailing zero (e.g., 30 + 40 = 7). 3 tens + 4 tens = 7 TENS, not 7 ones. The unit must travel through the answer.
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.
Inquiry-based learning starts with a question, not a formula — students explore, hypothesize, and verify before being told the rule. In Inquiry AI, every mission opens with a "Discovery" step (manipulate the model), then "Abstraction" (write the equation), then "Reflect" (apply to a new case). The procedure is never given upfront; learners derive it from their own observations.
