3rd Grade Addition Facts Worksheets and Activities

In this addition worksheet, students add whole tens (like 10, 20, 30, etc.) to 2-digit numbers. This helps build fluency with mental math and reinforces place value understanding. Worksheet instructions: Find the sum for each problem below.

In this worksheet, students practice adding whole tens (like 10, 20, 30, etc.) to 2-digit numbers. This helps build fluency with mental math, reinforce place value understanding, and strengthen addition skills in a structured way. Worksheet instructions: Find the sum for each problem below.

In this addition worksheet, students add a 1-digit number and a 3-digit number. Some problems involve regrouping. Worksheet instructions: Find the sum for each problem below.

In this worksheet, students add a 1-digit number to a 3-digit number. Some problems involve regrouping, making it great for building fluency and number sense. Worksheet instructions: Find the sum for each problem below.

In this addition worksheet, students add a 2-digit and two 1-digit numbers in their heads. It’s great mental math practice that helps build number sense and confidence with multi-step addition. Worksheet instructions: Find the sum for each problem below.

In this worksheet, students add one 2-digit and two 1-digit numbers in their heads. It’s great mental math practice that helps build number sense and confidence with multi-step addition. Worksheet instructions: Find the sum for each problem below.

In this addition worksheet, students "complete the hundred" by finding the missing addend in addition equations where the sum is 100. Students are encouraged to solve these exercises mentally, without writing down intermediate steps. Worksheet instructions: Find the missing number in each equation.

In this worksheet, students "complete the hundred" by finding the missing addend in addition equations where the sum is 100. Students are encouraged to solve these exercises mentally, without writing down intermediate steps, to build number sense and fluency. Worksheet instructions: Find the missing number in each equation.

In this addition worksheet, students practice finding missing addends in problems that combine a 2-digit number with a 1-digit number. The goal is to build fluency and confidence in mental math by solving these problems quickly and accurately. Worksheet instructions: Find the missing number in each equation.

In this worksheet, students practice finding missing addends in addition problems that combine a 2-digit number with a 1-digit number. The goal is to build fluency and confidence in mental math by solving these problems quickly and accurately. Worksheet instructions: Find the missing number in each equation.

This math worksheet is perfect for helping students practice completing equations that add up to 1,000 using whole hundreds. Each problem is designed to reinforce number bonds and place value understanding while encouraging mental math fluency. Worksheet instructions: Find the missing number that makes each equation equal 1,000.

This worksheet is perfect for helping students practice completing equations that add up to 1,000 using whole hundreds. Each problem is designed to reinforce number bonds and place value understanding while encouraging mental math fluency. Worksheet instructions: Find the missing number that makes each equation equal 1,000.

This math worksheet is ideal for helping students practice mental math strategies by finding missing addends in addition problems involving whole hundreds, with sums up to 2,000. It reinforces place value understanding, builds fluency in multi-digit addition, and strengthens problem-solving skills. Worksheet instructions: Find the missing number in each equation below.

This addition worksheet is ideal for helping students practice mental math strategies by finding missing addends in addition problems involving whole hundreds, with sums up to 2,000. It reinforces place value understanding, builds fluency in multi-digit addition, and strengthens problem-solving skills. Worksheet instructions: Find the missing number in each equation below.

This worksheet is ideal for helping students practice mental math strategies by finding missing addends in addition problems involving whole hundreds, with sums up to 2,000. It reinforces place value understanding, builds fluency in multi-digit addition, and strengthens problem-solving skills. Worksheet instructions: Find the missing number in each equation below.

This worksheet is excellent for helping students practice adding three whole-hundred numbers, with sums up to 3,000. It supports place value understanding, strengthens mental math fluency, and builds confidence in multi-digit addition. Regrouping of hundreds into thousands is required. Worksheet instructions: Find the sum for each problem

This math worksheet helps students practice adding three whole-hundred numbers, with sums up to 3,000. It supports place value understanding, strengthens mental math fluency, and builds confidence in multi-digit addition. Regrouping of hundreds into thousands is required. Worksheet instructions: Find the sum for each problem

This addition worksheet helps students practice adding three whole-hundred numbers, with sums up to 3,000. It supports place value understanding, strengthens mental math fluency, and builds confidence in multi-digit addition. Regrouping of hundreds into thousands is required. Worksheet instructions: Find the sum for each problem

This worksheet helps students practice adding whole hundreds with sums up to 2,000. It strengthens place value understanding, mental math fluency, and multi-digit addition skills. Regrouping of hundreds into thousands may be required for some of the questions. Worksheet instructions: Find the sum for each problem.

This addition worksheet helps students practice adding whole hundreds with sums up to 2,000. It strengthens place value understanding, mental math fluency, and multi-digit addition skills. Regrouping of hundreds into thousands may be required for some of the questions. Worksheet instructions: Find the sum for each problem.

This whole hundreds addition worksheet helps students practice adding whole hundreds with sums up to 2,000. It strengthens place value understanding, mental math fluency, and multi-digit addition skills. Regrouping of hundreds into thousands may be required for some of the questions. Worksheet instructions: Find the sum for each problem.

This addition worksheet helps students practice completing equations with four two-digit numbers that are multiples of ten, reinforcing their mental math skills and place value understanding. Worksheet instructions: Find the missing number in each equation.

This whole-tens addition worksheet helps students practice completing equations with four two-digit numbers that are multiples of ten, reinforcing their mental math skills and place value understanding. Worksheet instructions: Find the missing number in each equation.

This worksheet helps students practice adding three single-digit numbers with sums up to 30. It strengthens basic addition skills, number sense, and mental math fluency. Worksheet instructions: Find the sum for each problem

This worksheet helps students practice adding three single-digit numbers with sums up to 20. It strengthens basic addition skills, number sense, and mental math fluency. Worksheet instructions: Find the sum for each problem