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Marks a real script the way a teacher would.
- Ticks and crosses on the page
- Partial credit, step by step
- A reason for every lost mark
Maths · Class X · Q3(b)(3): In an A.P. the 19th term is 52 and the 38th term is 128. Find the sum of the first 56 terms.
Finds d = 4 correctlysets up a + 18d = 52 and a + 37d = 128
strengtha + 72 = 52 solved as a = 20calculation error · should be −20
slipAdds n/2 instead of multiplying28 + 40 + 220, not 28 × ( … )
conceptFinal answer 288correct sum is 5040
result10blocks diagnosis · Q3(b)(3) · Arithmetic progressions
Diagnosis → Struggles to project Arithmetic Progression numbers
One calculation slip and one concept gap. They need different fixes.
STRENGTHSets up both term equations and finds d = 4
SLIPa + 72 = 52 solved as a = 20 instead of −20
CONCEPTWrites Sn = n/2 [2a + (n−1)d] correctly, then treats n/2 × [ … ] as addition
RESULT288 instead of 5040
But a score isn't a diagnosis
So 10blocks reads every step.
Step-level reading
What went right, and what broke.
Every answer holds a diagnosis
Tells a slip apart from a concept gap.
+ 28 more students · Class X · Maths · 38 scripts
Student by student · concept by concept
See the whole class at once.
TFor the teacher
Explain the logic of why an Arithmetic Progression is the way it is.
12 of 38 students wrote the formula correctly, then added n/2 instead of multiplying.
▸ Remedial class · Group B · 12 students · Thu 25 min
SFor the student
You found d correctly. Two things to fix.
When 72 moves across, its sign flips: a = 52 − 72 = −20. And n/2 multiplies the whole bracket: 28 × 180 = 5040.
▸ 4 practice problems on A.P. sums · 10 min
Guidance
Tells teachers and students what to do next.
Remedial class kit · applying Sn
TXT
NCERT Mathematics XArithmetic Progressions · sum of first n terms
link ↗VID
Why n/2 multiplies the bracketvideo · 5 min
link ↗SET
Practice set · 12 questionshandwritten · checked by 10blocks
link ↗RE
Re-test in 7 daystrack whether the gap closed
scheduledCheck
Diagnose
Guide
Remediate
Re-test
One loopmistake → mastery
Remedy
Every gap gets a class, and a plan.
10blocks
See the concept behind every answer.
CHECK → DIAGNOSE → GUIDE → REMEDIATE → RE-TEST
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The first three scenes use a real script checked by 10blocks and its evaluation report, with the student's name hidden. The class view, guidance and remedial kit scenes are illustrative.