mathdiscovery.com › 2nd-grade-addition-worksheets2nd Grade Addition - Math Worksheet from Math Discovery 2nd Grade Addition - Adding Doubles Adding doubles is easy to visualize. For numbers 1 to 5, they can be modeled easily on two hands. They will be asked to solve each equation and write the answers in the blanks. 2.OA.B.2 View Worksheets 2nd Grade Addition -Make a Ten Adding a one-digit number to 10 can be done mentally.