Addition Subtraction within 20

Addition and Subtraction within 20. Math Learning System: For Elementary math

Addition and Subtraction within 20

1. Math Learning System: For Elementary math

2. Stage One: Addition & Subtraction Within Twenty

3. Target Students: Grade One Elementary Students

4. Can handwrite on smartphones and tablets. On top of calculation practice, users can also practice the correct

strokes of each number.

5. Practice scores can be saved for record.

6. Practice scores can be sent to teachers or parents.

7. The speed and accuracy of solving each question should reach above nation’s mid or high level before moving on

to the next stage.

The chapter for practice :

(1) Vertical Addtion within 10

(2) Vertical Subtraction within 10

(3) Vertical Addtion within 20

(4) Vertical Subtraction within 20

(5) Horizontal Addtion within 10

(6) Horizontal Subtraction within 10

(7) Horizontal Addtion within 20

(8) Horizontal Subtraction within 20