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| Skill 15A Count Back by 10's to Subtract |
 Subtract
tens to help solve. |
|
50 - 30 = |
Subtract tens to help solve. |
5 tens - 3 tens = 2 tens |
50 - 30 = 20 |
|
|
|
|
|
| Skill 15A Count Back by 10's to Subtract |
| Subtract
tens to help solve. |
|
50 - 30 = |
Subtract tens to help solve. |
5 tens - 3 tens = 2 tens |
50 - 30 = 20 |