Master core mathematical concepts through our interactive Socratic curriculum.
Search Intent Match
This hub is for students who need free tensadd practice that shows the reasoning, not just the answer. It groups 30 browser-based missions around adding multiples of ten by changing the tens place, aligned with 1.NBT.C.4.
The companion guide explains it as: Add multiples of 10 within 100 — when you add tens, the ones digit never changes.
Practice Goals
Common Mistakes
Use Cases
Use after teen numbers so ten is treated as a unit.
Ask what changes and what stays the same when 20 is added.
Complete one mission, then say what changed, what stayed the same, and why the final answer makes sense.
Indexable Practice
Everything you need to know about the Socratic experience.
There are 30 missions in this topic — 10 Seedling (entry-level), 10 Explorer (core), and 10 Challenger (stretch). Each mission has 3 Socratic steps with adaptive hints.
This topic is aligned with CCSS 1.NBT.C.4. Open the topic guide for the standard's full text and a step-by-step breakdown of the cognitive sub-skills.
Start with Seedling missions to anchor the visual model, then move to Explorer for the core abstraction, and tackle Challenger only when Explorer is flawless. Difficulty badges on each card show this progression.
Never! At this age, children are naturally inquisitive. We use visual objects and story-based scenarios to make logical inquiry feel like play.
By teaching children to visualize the 'scenario' (like birds on a tree) before they see the numbers, we eliminate the confusion that often comes with word problems.
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.
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.
