Welcome to "Sprinkle Grain Sorter", a 1st Grade Placevalue mission at the Seedling (entry-level) level, staged in our bakery scenario. The mission opens with a hands-on prompt: "Build 17 with base-ten blocks. Use 1 ten-rod and 7 units." You'll work with the numbers 17, 1, 7 and arrive at a final answer of 20 across 3 guided steps.
Behind the bakery story, this lesson is really about placevalue aligned to CCSS 1.NBT.B.2. Understanding that two-digit numbers are built from tens and ones — the power of grouping by 10. The key strategy this mission asks you to internalise: Position gives value: tens digit × 10.
A general pattern to watch for in 1st Grade placevalue — illustrated with example numbers below, which may differ from this lesson's: Confusing which place is tens vs ones. Right-most column is ALWAYS ones. Move left: ones, tens, hundreds. Point while saying it. If you get stuck on "Sprinkle Grain Sorter", 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 · Placevalue
Mission Progress
0/3
Thinking Summary · 1
Mastered[object Object]
[Discovery] Build 17 with base-ten blocks. Use 1 ten-rod and 7 units.
1
Active StepBuild the number 17 using flats, rods, and units.
Everything you need to know about the Socratic experience.
Build 17 with base-ten blocks. Use 1 ten-rod and 7 units. Hint: Add 1 rod (each = 10) and 7 units (each = 1).
If we add 3 more ONES to 17, what number do we make? If you get stuck, the adaptive hint is: After rolling over, the tens digit goes up by 1, ones digit goes to 0.
Seedling missions anchor the visual model with small, friendly numbers — ideal as the first attempt at this topic. Within 1st Grade Placevalue, expect numbers in the corresponding range.
Treating each digit as just its face value. Ask: "In 37, how much is the 3 really worth?" Answer: 30, not 3. Repeat daily.
Comparing (Two-digit comparison rests entirely on tens-vs-ones logic.). Open /grade-1/comparing 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.
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.
