Expanded Sums
About This Worksheet
Expanded Sums is a second grade addition activity that helps students break two-digit numbers into tens and ones before adding. Each problem shows both addends written in expanded form, such as 24 = 20 + 4 and 13 = 10 + 3. Students add the tens, add the ones, and then combine those parts to find the total. For example, 20 + 10 makes 30 and 4 + 3 makes 7, so 24 + 13 equals 37. This helps children understand what each digit means instead of treating the numbers as one big chunk.
Curriculum and Grade Alignment
This worksheet is made for second grade learners who are strengthening place-value understanding while adding two-digit numbers. The main goal is to help students use expanded form to separate tens and ones and then recombine them. Before using this page, your child should understand the value of the tens and ones digits in a two-digit number. The next step is using this same thinking in vertical addition, especially when regrouping is needed. This activity supports place-value reasoning, decomposition, and accurate two-digit addition.
Student Tasks
On this worksheet, students will solve eight addition problems. They will rewrite each addend in expanded form, add the tens, add the ones, and then write the final total. Some problems will create 10 or more ones, so students need to think carefully about regrouping. The repeated layout helps them follow the same process from one problem to the next. This builds addition fluency, place-value thinking, and organized problem solving.
Common Challenges and Misconceptions
Some students may break a number apart incorrectly, such as writing 47 as 4 + 7 instead of 40 + 7. Others may add the tens and ones correctly but forget to combine those partial sums. A child may also struggle when the ones add to more than 9. Encourage your child to say each number in place-value language, such as, “47 is 4 tens and 7 ones.” This makes the expanded form much easier to build correctly.
Implementation Guidance
Teachers can use this worksheet after students have worked with base-ten blocks or place-value charts. It works well as a bridge from visual models to written strategies. Parents can ask the child to break each addend apart aloud before writing anything. If regrouping is needed, show how 10 ones can become 1 extra ten. This keeps the method connected to place value rather than memorized steps.
Details and Features
This worksheet includes eight two-digit addition problems with spaces for expanded form, tens totals, ones totals, and final answers. The structured boxes help students keep the steps in order. The problems use a variety of two-digit addends, including examples that require regrouping. The page gives students enough support to focus on the strategy itself. The printable supports expanded form, place value, regrouping, and addition fluency.