My Math Notebook
Save a calculation. Compare your options. Keep learning.
Saved on this device and browser. Use a backup to move your records to another device.
Calculation notebook
Save results from website calculators, or enter a shift here.
Add or edit a work shift
An earlier end time is treated as the following day. Identical times mean zero elapsed time. This tool does not adjust for time zones or daylight-saving changes.
Weekly hours
Sunday–Saturday. Totals use worked minutes after breaks; rounding is applied only for display.
Compare scenarios
Change one option at a time and compare the result and its assumptions.
Learning progress
Mark lessons complete as you study. Practice results track your recent first-answer accuracy by topic.
Practice by skill
“Strong recent practice” means at least 10 answers and 90% accuracy among the latest 20 answers for that skill. It is a practice indicator, not a certification.
Practice a skill
Mistake review notebook
Missed questions from this practice area, the Quiz Center and Times Math practice are saved with their explanations.
Try a similar problem
Read-aloud & display
Use “Read result & steps” beside a calculator result, or read the visible content of this page. Voices depend on your browser and installed device voices.
Offline speech works only when your device has an available offline voice. Calculations and saved records do not require speech support.
Using the phone app
Open the phone app once while connected and wait for “Offline tools ready.” On iPhone, open it in Safari, tap Share, then Add to Home Screen. On Android, use Install app when offered or the browser’s install menu.
The offline app includes this notebook, scenario tools, hours calculations, math practice, progress and mistake review. Links to the full calculator library still need an internet connection.