# Math Practice Topic: Understanding 11 to 19

 Description: Compose and decompose numbers from 11 to 19 with and without visuals. Adaptive Learning Progression: Start with just counting, then do base 10 equation with visuals, then do the same equation without visuals. Start using MathScore for free

## Sample Levels (out of 6)

Count the number of shaded squares.

1.

2.

Choose the tens + ones form of the number -- for example, 1X = 10 + X.

1.

 12 = 11 + 1
 12 = 12 + 0
 12 = 1 + 2
 12 = 10 + 2
 12 = 10+1+1
2.

 15 = 12 + 3
 15 = 1 + 5
 15 = 10 + 5
 15 = 15 + 0
 15 = 14 + 1
 15 = 10+1+1+1+1+1
3.

 13 = 10+1+1+1
 13 = 13 + 0
 13 = 11 + 2
 13 = 12 + 1
 13 = 1 + 3
 13 = 10 + 3
4.
 17 = 1 + 7
 17 = 13 + 4
 17 = 17 + 0
 17 = 14 + 3
 17 = 10 + 7
 17 = 10+1+1+1+1+1+1+1

Complete the equation in the form of tens + ones (e.g., 10 + 5).

1.
17 =
 17 = 1 + 7
 17 = 10 + 7
 17 = 13 + 4
 17 = 16 + 1
 17 = 17 + 0
 17 = 10+1+1+1+1+1+1+1
2.
12 =
 12 = 1 + 2
 12 = 11 + 1
 12 = 12 + 0
 12 = 10 + 2
 12 = 10+1+1
3.
17 =
 17 = 1 + 7
 17 = 11 + 6
 17 = 15 + 2
 17 = 10 + 7
 17 = 17 + 0
 17 = 10+1+1+1+1+1+1+1
4.
11 =
 11 = 10 + 1
 11 = 11 + 0
 11 = 1 + 1