Supplemental math · Grades 3–4
Stop guessing. Start guiding.
Know what to work on tonight.
Navr.io — pronounced “Navario” — finds the weak link underneath the grade, strengthens it, and keeps building from there.
Free Skill Scan · about 5 minutes
Skills on the reviewed map
- Showing a fraction in more than one way, Grade 3: Not enough evidence
- Spotting two fractions that are worth the same, Grade 3: Not enough evidence
- Making a fraction worth the same as another, Grade 3: Not enough evidence
- Seeing that different fractions can name the same amount, Grade 4: Not enough evidence
- Working with tenths and hundredths together, Grade 4: Not enough evidence
- Writing tenths and hundredths as decimals, Grade 4: Not enough evidence
- Deciding which of two decimals is larger, and saying why, Grade 4: Not enough evidence
- Building a fraction out of copies of its smallest piece, Grade 4: Not enough evidence
- Adding and subtracting fractions that share a bottom number, Grade 4: Not enough evidence
- Splitting one fraction into two chunks in several different ways, Grade 4: Not enough evidence
- Reading and writing numbers up to ten thousand, Grade 3: Not enough evidence
- Knowing each place is worth ten times the place to its right, Grade 4: Not enough evidence
- Rounding a big number to a nearby friendly number, Grade 4: Not enough evidence
Reviewed relationships
- Showing a fraction in more than one way to Spotting two fractions that are worth the same: direct prerequisite.
- Spotting two fractions that are worth the same to Making a fraction worth the same as another: direct prerequisite.
- Knowing each place is worth ten times the place to its right to Rounding a big number to a nearby friendly number: direct prerequisite.
- Building a fraction out of copies of its smallest piece to Adding and subtracting fractions that share a bottom number: direct prerequisite.
- Seeing that different fractions can name the same amount to Working with tenths and hundredths together: direct prerequisite.
- Working with tenths and hundredths together to Writing tenths and hundredths as decimals: direct prerequisite.
- Knowing each place is worth ten times the place to its right to Writing tenths and hundredths as decimals: direct prerequisite.
- Writing tenths and hundredths as decimals to Deciding which of two decimals is larger, and saying why: direct prerequisite.
- Reading and writing numbers up to ten thousand to Knowing each place is worth ten times the place to its right: supporting relationship, not required.
- Spotting two fractions that are worth the same to Seeing that different fractions can name the same amount: direct prerequisite.
- Showing a fraction in more than one way to Building a fraction out of copies of its smallest piece: direct prerequisite.
- Splitting one fraction into two chunks in several different ways to Adding and subtracting fractions that share a bottom number: supporting relationship, not required.
The Math Map
Math builds on math.
Every skill rests on the ones beneath it. When something below is shaky, everything above it gets harder — and it rarely looks like the real problem.
A child can finish the same homework as everyone else and still be missing something.
Homework gets done. Tests come back fine, mostly. And then a year later, fractions are a fight and nobody can say exactly why.
That’s because math compounds. A shaky understanding of how multiplication works can show up later as trouble with division, fractions, area, and multi-step problems.
Parents can’t see that structure. Navario can.
How navr.io works
One signal becomes a path forward.
In this example, a question about equal groups gives us one data point. Because the ideas are connected, that point tells us where to strengthen now — and what stronger understanding can unlock later.
Equal groups
Multiplication relationships
Division relationships
Fractions & ratios
Not a prediction from one answer. An example of a connection navr.io would keep checking in different forms.
A continuous loop
Each answer shapes what comes next.
navr.io does not march through a fixed worksheet. It keeps returning to the evidence, checking what changed, and choosing the next useful connection.
Discover
A few well-chosen questions find one useful signal.
Understand
The signal is placed in the reviewed structure around it.
Strengthen
Practice starts at the most useful foundation.
Grow
Reliable understanding opens the next idea.
- Then the loop begins again with new evidence.
You stop deciding what to practice.
No worksheets to choose. No topics to pick. A short daily session, already assembled — and a plain-English note telling you what it meant.
- It finds the gap you couldn’t see
- Navario follows the difficulty down to the skill actually causing it.
- It practices the cause, not the symptom
- Strengthen the foundation first, then return to the skill that was failing.
- It keeps old skills alive
- Things learned weeks ago come back at the right moment so they stay solid.
- It tells you what it noticed
- A short weekly read on what’s clicking, what’s slow, and what to say at dinner.
Built with both sides of the problem in view
Product thinking shaped by McKinsey experience, more than a decade in elementary education, and advisors with decades in elementary administration.
The goal is not to make parents read school data. It is to translate careful mathematical reasoning into one useful next step at home.
Start with one honest look.
We’re looking for the one place a little attention would go furthest.
Find my child’s starting point