Subtraction and Addition
v1 · 16.9 MB · code 1
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File information
UpdatedOct 29, 2024
PublishedJan 5, 2020
Packagecom.poltro.subtractionandaddition
Versionv1 (1)
Size16.9 MB
MD51dd594a5153fd4e8fe5e300f846d31f8
Min SDK21
ABIsarmeabi-v7a, arm64-v8a
Malware scanTRUSTED
Signature SHA1B2:2E:B0:13:4D:4A:DA:0F:FF:D6:D5:F3:7D:A8:F1:21:84:C7:A0:82
SignerCN=alek, OU=polantronic, O=pl, L=lub, ST=dln, C=pl
Total downloads101
This version101
DeveloperPoltro
Age ratingEveryone
Security scan
TRUSTED
- Developer signature verified 2020-01-19
- Scanned for malware 2020-09-04 11:56:57
- Signature SHA1 B2:2E:B0:13:4D:4A:DA:0F:FF:D6:D5:F3:7D:A8:F1:21:84:C7:A0:82
- File MD5 1dd594a5153fd4e8fe5e300f846d31f8
How to install Subtraction and Addition v1 on Android 5.0 Lollipop+
Takes about 2 minutes. You'll need roughly 16.9 MB of free storage.
- Grab com.poltro.subtractionandaddition_1.apk — hit the Download button above (16.9 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 1dd594a5153fd4e8…. Any difference means the file is corrupted or tampered — delete and re-download.
- Open the APK — tap the download notification, or find com.poltro.subtractionandaddition_1.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=alek, OU=polantronic, O=pl, L=lub, ST=dln, C=pl. 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 Subtraction and Addition — tap Open on the install screen, or find the Subtraction and Addition icon in your app drawer (this build targets armeabi-v7a/arm64-v8a devices).
Common install errors for Subtraction and Addition
- "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 5.0 Lollipop 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.
- Works on one phone but not another — this build ships armeabi-v7a/arm64-v8a native code. Devices with a different CPU will reject it.