A typical AI appHands over the answer
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Work out −9 − (−4)
−9−(−4) = −9+4 = −5.
Okay, thanks
Ask anything
Copied. Nothing learned.
Free beta · applications open
The AI that makes your child think.
Sopherlo finds the topics your child is missing, even from earlier classes, and teaches them until they stick. All the way to WAEC and NECO.
- Hints, never answersThey work it out themselves
- Finds the real gapEven from earlier classes
- WAEC and NECO readyOn the NERDC curriculum
Let's do it together
Work out −9 − (−4).
Great job, Ada! −9 + 4 is −5.
Extra lessons often repeat this term's work. But when a child is stuck, the real gap is usually a topic from an earlier class that nobody caught. Sopherlo finds that topic , teaches it properly, and builds forward
What the AI does
A tutor's eye on every answer.
Sopherlo's AI watches how your child works, not just whether they're right, and changes the lesson around them.
Spots the slip. Ada wrote −13. Sopherlo sees she took away 4 instead of adding it, and marks that exact step.
Negative numbers · JSS1
Work out −9 − (−4).
−9 − 4 = −13minus a negative is plus
−13
Rewrite − (−4) as + 4.
Check
DiagnosticStart here
SSS1Simultaneous equations
JSS3Linear equations
JSS2Solving for x
JSS1Negative numbers
Start with negative numbers
Worked example
Work out −9 − (−4).
Moving 4 to the right
Continue
Your working
−9 − (−4)= −9 − 4= −13sign flipped here
Explain it backNegative numbers · Mastered
In your own words: why does −9 − (−4) equal −9 + 4?
Taking away a debt is like adding money.
- Links subtraction to addition
- Uses the sign rule
- Gives an example
Check
Reviews
Negative numbersJSS1 · Mathematics
Built to make them think
The answer is always theirs.
Plenty of apps will hand your child an answer. Sopherlo gives them the next step instead, and the last step is always theirs.
62%
of students now use AI for homework help, so we help them do it the right way.
67%
of people believe more AI use for schoolwork harms critical thinking.
Source · RAND, 2025
SopherloGives the next step
Work out −9 − (−4).
Hint 1
What is the question asking you to find?
Hint 2
This is about subtracting a negative number.
Hint 3
Rewrite − (−4) as + 4 first.
Ada
−5
Worked out. Theirs to keep.
Who it's for
Built for the people around every learner.
Parents
Know what they've mastered. Any time.
Not just at report-card time. See what your child has mastered and what they're working on.
Students
The answer is always yours.
Lessons at your level. Hints that make you think.
Lesson teachers
Spend every session where it counts.
See which topics need your time, and the mistakes behind them.
SchoolsPilots from 2027
A whole class, topic by topic.
See where every student stands, and the mistakes a class shares.
Why it matters
The results already show the gap.
WASSCE candidates who got five credits including English and Mathematics.
WASSCE
2024Candidates with five credits72.12%
Needs attention
2025Candidates with five credits62.96%
Roughly 37% fell short
Remarks from parents
95%
of parents say a child has fallen behind in a subject.
65%
found out only from a report card or exam result.
How the beta works
Three steps to get in.
Step 1
Tell us about your child
Fill in a short survey about your child's class and subjects.
Step 2
We allocate slots
Slots are limited. Families who answered our parent survey get priority.
Step 3
Your child starts
They begin with a short diagnostic, then lessons at their level.
A note from the founder
Most children who struggle at school aren't bad at it. They're usually missing one or two topics from an earlier class, and everything built on top of those topics starts to wobble.
Extra lessons tend to repeat this term's work, so the gap stays hidden until the report card arrives. Sopherlo is our way of finding that gap early and fixing it properly, one topic at a time, in every subject. Our AI does the noticing that's hard in a crowded class: every answer, every slip, every child.
We're starting with a small, free beta. If your child is in secondary school, we'd love your family to help us shape it.
- Omzi
Yes. The beta is free for every family who gets a slot.
Join the beta
Let's find what your child is missing.
Free during the beta. Slots are limited.