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If you would like to go back to your early days of learning math using pencil and paper, this app lets you relive those moments, writing math expressions naturally while delivering solutions immediately.

If you're looking for a bookmarking tool that syncs across devices, then look no further. Better than Instapaper and other competitors, Pocket is the app to beat in the category.

If you are looking for an app that is essentially a digital pad of colored sticky notes for grocery lists and quick reminders, then Google Keep is perfect. Otherwise, look elsewhere or wait until this newborn gets upgraded with more powers.

If you're looking for a full-featured note-taking app that syncs across all platforms -- or just an easy way to keep track of your digital odds and ends -- Evernote is the best I've seen for Android.