Sum Checker
About This Worksheet
Sum Checker is a second grade review activity that helps students decide whether a two-digit addition equation is correct. Each row shows an addition problem with a completed total, and children circle True or False. If the equation is false, they solve it again and write the correct answer in the last column. For example, if 37 + 28 is shown as 55, students need to notice that the total is not right and fix it. This helps children practice addition while also learning to check someone else’s work.
Curriculum and Grade Alignment
This worksheet is made for second grade learners who are ready to check the accuracy of two-digit addition problems. The main goal is to help students solve, verify, and correct addition equations with and without regrouping. Before using this page, your child should already be able to add two-digit numbers and understand how tens and ones line up. The next step is checking their own work with a second strategy, such as estimation or subtraction. This activity supports second grade addition by building accuracy, number sense, and self-checking habits.
Student Tasks
On this worksheet, students will examine eight completed addition equations. They solve or check each problem, circle True if the shown total is correct, or circle False if it is not. When an equation is false, children write the correct total in the final column. The problems include a mix of accurate and inaccurate answers. This builds computation, error checking, and careful comparison.
Common Challenges and Misconceptions
Some students may circle True because an answer looks reasonable without actually adding. Others may correctly identify a false equation but forget to write the corrected total. A child may also make the same regrouping mistake that appears in the printed problem. Encourage your child to solve each equation independently before looking closely at the given answer. Then compare the two totals and decide whether they match.
Implementation Guidance
Teachers can use this worksheet as an addition review after students have learned standard two-digit addition. It works well as an informal check because children have to do more than simply calculate a sum. Parents can ask the child to cover the True/False section, solve the problem first, and then compare their answer with the one shown. If the answers are different, have the child explain which one makes sense and why. This builds stronger checking habits.
Details and Features
This worksheet includes eight two-digit addition equations in a three-column chart. Students decide whether each equation is true or false and have space to correct inaccurate sums. The table format keeps the checking process organized from left to right. Several problems involve regrouping, which gives students useful practice with common error areas. The printable supports addition fluency, error detection, reasoning, and self-correction.