DosePad
Dimensional analysis for dosage practice. The chain shows the work. The tutor explains the math under it.
Your name
Type the name you want on your work. The same name on this phone opens it again. No password.
Type the numbers
Or paste the problem
Paste the wording from a worksheet. Read this figures out the problem. The type buttons above are only for numbers you type yourself.
Or use a photo
A photo solves from the picture. It does not change the numbers you typed.
Drop a photo of the problem
The work shows up from the photo.