PlainPlay vs 数学小练习

My file manager – supports almost all file formats. Online courses downloaded from the web or shared by teachers are easy to import. With full-format playback, you can watch them anytime, anywhere with no data usage — with loop playback, sequential playback, and variable-speed support. A convenient learning video player that makes your study easier. Import files to your phone in multiple ways (iTunes file sharing via cable, LAN Wi-Fi web transfer, and phone-to-phone transfer) for fast management of local files. Supports file classification, sorting, editing, searching, and quick browsing and playback. • Classification: Video, Audio, Photos, Documents • Sorting: Name, manual order, file size, modification date, creation date • Edit: Select all, delete, compress • Search: Search by file name • Privacy: Gesture lock, fingerprint & Face ID; file hiding and file encryption Video and audio support continuous playback and single-loop playback; audio supports background playback, skipping intros and outros. File management: Create folders and move or import files directly. Web download: Download and manage web content directly. TV live streaming: HD live streams of major TV channels. Markdown preview and editing supported. 【Auto-Renewable Membership】 1. Service name: Auto-renewing membership. 2. Price: $1.49/month, $6.99/year, $12.99 lifetime (one-time purchase). 3. Payment is charged to your iTunes account 24 hours before each renewal period ends, extending the membership for one month. 4. To cancel: open "Settings" → "iTunes Store & App Store" → tap "Apple ID" → "View Apple ID" → "Account Settings" → "Subscriptions", and cancel the PlainPlay membership subscription. If not cancelled at least 24 hours before the period ends, the subscription renews automatically. 5. Terms of Use: https://xiaodev.com.cn/terms.html 6. Privacy Policy: https://xiaodev.com.cn/privacy.html If you find bugs, infringements, unmet needs, or have other opinions or suggestions about the service, please contact us — we will do our best to improve these issues in the next version. Contact: xiaodeve@163.com .

数学小练习是一款数学启蒙工具，通过有趣的互动练习，帮助孩子培养数感、提高计算能力。 【六大练习模块】 ● 数独 — 4×4 / 6×6 / 9×9 三种难度，锻炼逻辑思维 ● 加法练习 — 100 以内加法，选择答案即时反馈 ● 减法练习 — 100 以内减法，结果不为负 ● 乘法练习 — 9×9 乘法表，夯实乘法基础 ● 除法练习 — 表内除法，逆向理解乘除关系 ● 质数练习 — 100 以内质数判断与识别，混合出题 【功能特色】 ● 每次练习计时，自动记录成绩 ● 历史最佳正确率、平均正确率统计 ● 按题量分类查看练习数据 ● 错题回顾，针对性改进 ● 界面简洁清爽，操作直观 让孩子在轻松练习中爱上数学！