Math theory
v4.0.0 · 17 MB · code 40000
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File information
UpdatedApr 25, 2022
PublishedJan 15, 2021
Packagecom.sangaku.maths.en
Versionv4.0.0 (40000)
Size17 MB
MD52b4c135a584cff669441844bd3e881f6
Min SDK19
Malware scanTRUSTED
Signature SHA1C8:CC:16:FC:7E:23:1B:1E:93:B4:51:7F:3B:67:A6:1B:DF:F2:52:E9
SignerCN=Israel Fenor, OU=CTO, O=Sangaku, L=Barcelona, ST=Catalunya, C=ES
Total downloads1,000,000
This version1,000,000
DeveloperSangaku
Age ratingEveryone
Security scan
TRUSTED
- Developer signature verified 2022-04-25
- Scanned for malware 2022-04-25 04:03:33
- Signature SHA1 C8:CC:16:FC:7E:23:1B:1E:93:B4:51:7F:3B:67:A6:1B:DF:F2:52:E9
- File MD5 2b4c135a584cff669441844bd3e881f6
How to install Math theory v4.0.0 on Android 4.4 KitKat+
Takes about 2 minutes. You'll need roughly 17 MB of free storage.
- Grab com.sangaku.maths.en_40000.apk — hit the Download button above (17 MB). If your browser warns about APK files, choose Keep or Download anyway — that warning fires on every APK, not just this one.
- Trust your browser to install — on Android 8+ go to Settings → Apps → Special access → Install unknown apps, pick the app you downloaded with (Chrome, Firefox, Files, etc.), and flip Allow from this source. On older Android, toggle Unknown sources under Security.
- (Optional) Verify the file — compute the MD5 of the downloaded APK and make sure it matches 2b4c135a584cff66…. Any difference means the file is corrupted or tampered — delete and re-download.
- Open the APK — tap the download notification, or find com.sangaku.maths.en_40000.apk in your Files app under Downloads, then tap it. Android's package installer will appear.
- Check the signer — the install screen will name the publisher. For this build it should read CN=Israel Fenor, OU=CTO, O=Sangaku, L=Barcelona, ST=Catalunya, C=ES. If it doesn't match, cancel — you have the wrong file.
- Review permissions & tap Install — scroll the permission list, then confirm. If Play Protect flags it, tap Install anyway (this APK was scanned as TRUSTED).
- Done — open Math theory — tap Open on the install screen, or find the Math theory icon in your app drawer.
Common install errors for Math theory
- "App not installed" — usually means an older or differently-signed version is already on your device. Uninstall it first, then retry. Your data may be lost unless you back it up.
- "Parse error" — the APK is for a newer Android than yours. This version needs Android 4.4 KitKat or later. Pick an older build from the versions list below.
- "There was a problem parsing the package" — the download was interrupted. Delete the file and re-download over Wi-Fi.