Adding Mentaly

Language: English
Subject: Math > Addition
Age: 12 -

Solve the following problems by adding mentaly and choose the correct answer.

1.) 5+ 5 + 1 + 2+ 1 =

2.) 3 +3 +3 + 1 + 2=

3.) 5 + 5 + 5 + 5+ 1 =