MathScore Practice: Mental Addition and Subtraction

Description: Adding and subtracting with 10 and 100 to be done mentally.

Adaptive Learning Progression: Starts with addition, moves to subtraction, then mixes them.

Sample Levels (out of 8)

30	0% Mastery

Add or subtract.

1.	171 + 100 =

2.	228 + 10 =

70	65% Mastery

Add or subtract.

1.	375 - 100 =

2.	657 - 100 =

3.	419 - 10 =

4.	583 - 10 =

5.	220 - 10 =

6.	466 - 100 =

90	100% Mastery

Add or subtract.

1.	506 + 100 =

2.	349 - 100 =

3.	190 + 100 =

4.	607 - 100 =

5.	679 - 100 =

6.	400 - 100 =

7.	569 + 10 =

8.	252 + 10 =

9.	647 + 10 =

10.	420 + 100 =