0CORRECT
0 / 70ANSWERED
—ACCURACY
0STREAK
ADDITION
8+5=
Enter an answer to start the timer.
🌟
Great job!
0 / 0CORRECT
—ACCURACY
0:00TIME LEFT
💧
Finish It
Add and subtract within 20. 3-minute challenge!
Set up your math mission
Pick the problems that feel right for you.
How would you like to practice?
Choose one or more operations
Smaller factor first. Division uses the same fact families.
Addition answers and subtraction starting numbers stay within the selected maximum (20 by default). Subtraction answers are never negative. Per mission or worksheet: addition has at most one zero fact and three one facts, including reversed sums; subtraction has at most one subtract-zero, two equal-number, and two subtract-one facts. Regrouping is allowed by default for facts within 20. Division always has a whole-number answer. Other facts repeat only after the available facts have been used. A 70-problem sheet prints as 7 columns × 10 rows.