Subtraction Math Trainer vs NCA
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Subtraction Math Trainer
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Subtraction Math Trainer is a math learning app designed to help you to practice subtraction. The built-in handwriting recognition allows you to draw answers directly on the screen. Comes with a number of simple mini-games to make learning more effective and less boring. You can practice the following math skills: Subtraction facts - numbers up to 10 Subtraction facts - numbers up to 18 Subtract a multiple of ten Relate addition and subtraction Subtraction facts - numbers up to 20 Subtract a one-digit number from a two-digit number Subtract two two-digit numbers Subtract multiples of 10 Subtract multiples of 100 Subtract multiples of 10 or 100 Balance subtraction equations Subtraction facts - numbers up to 100 Subtract two three-digit numbers Complete the subtraction sentence up to three digits Subtract numbers with four or five digits Balance subtraction equations up to three digits
NCA
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PASS YOUR NVIDIA NCA-AIIO: AI INFRASTRUCTURE AND OPERATIONS EXAM 500+ practice questions 5-minute study sessions Track your progress Remove mastered questions Text-to-speech support Dark mode available WHY GET CERTIFIED? Certified AI infrastructure professionals earn up to $203K annually (Skillsoft 2024). NCA-AIIO validates foundational knowledge of AI computing infrastructure and operations in enterprise environments. WHAT YOU'LL MASTER: NVIDIA software stack for AI environments Training vs inference architecture requirements AI, machine learning, and deep learning concepts GPU vs CPU architectures and acceleration NVIDIA TensorRT and GPU Operator DGX SuperPOD and data center platforms Bluefield DPU for workload offloading InfiniBand and NVSwitch networking Kubernetes orchestration and job scheduling Data analysis and visualization techniques Model evaluation with statistical metrics Energy-efficient computing strategies Cloud AI deployment considerations MLOps and AI lifecycle management STUDY ANYWHERE: Coffee breaks. Commutes. Lunch hours. Turn dead time into AI infrastructure expertise. Download now. Pass your exam. Master NVIDIA AI infrastructure.
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Verdict
The clearest difference is price: NCA at Free against Subtraction Math Trainer's $2.99. NCA also leads on update cadence (every 3 months vs every 34 months). Subtraction Math Trainer's advantage is iOS requirement (12.0 vs 15.0). On ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
NCA is free to download; Subtraction Math Trainer costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Subtraction Math Trainer ships an update every 34 months, NCA every 3 months. The most recent releases landed on October 31, 2026 and October 28, 2026 respectively.
| Parameter | Subtraction Math Trainer | NCA |
|---|---|---|
| Price | $2.99 | Free — better |
| Update frequency | Every 34 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 18 MB | 26 MB |
| Age rating | 4+ | 4+ |
| Developer | Sergey Malugin | Davy Raitt |
In-app purchases
Subtraction Math Trainer
No in-app purchases
NCA
No in-app purchases
Questions
Is Subtraction Math Trainer free?
Is NCA free?
Do Subtraction Math Trainer or NCA have ads?
Which is updated more often, Subtraction Math Trainer or NCA?
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