As students work with numbers within 100, they can practice adding two digit numbers by using the standard algorithm. My second graders practice this skill during the second month of school, using the I-Ready curriculum. I typically give this as morning work as additional practice. Twenty-five pages are included of five different equations to solve. Although the five equations will remain the same, I designed the worksheets to encourage more independence as time progresses as most students struggle to show their work when asked. This also includes answer keys.