3rd Grade Missing Numbers Worksheets and Activities

In this worksheet, students find the missing number when a 2-digit number is added to a whole ten (like 10, 20, 30, etc.). All questions have a missing addend. Worksheet instructions: Find the missing number in each equation.

In this addition worksheet, students find the missing number when a 2-digit number is added to a whole ten (like 10, 20, 30, etc.). All questions have a missing addend. Worksheet instructions: Find the missing number in each equation.

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.

In this subtraction worksheet, students practice subtracting whole tens from numbers up to 1,000. All problems involve easy, no-regrouping subtraction, making it ideal for building confidence and improving mental math skills. Worksheet instructions: Find the missing number in each problem below.

In this worksheet, students work on subtracting whole tens from numbers up to 1,000. All problems involve easy, no-regrouping subtraction, making it ideal for building confidence and sharpening mental math strategies. Worksheet instructions: Find the missing number in each problem below.

In this subtraction worksheet, students practice subtracting a single-digit number from 3-digit numbers (up to 999). Most problems involve regrouping. Worksheet instructions: Find the missing number in each subtraction problem.

In this worksheet, students need to subtract a single-digit number from 3-digit numbers (up to 999). Most problems involve regrouping. Worksheet instructions: Find the missing number in each subtraction problem.

In this worksheet, students need to subtract a single-digit number from 2-digit numbers (up to 99). Some problems involve regrouping, offering students an opportunity to reinforce their subtraction skills and deepen their understanding of place value. Worksheet instructions: Find the missing number in each subtraction problem.

In this subtraction worksheet, students practice subtracting a single-digit number from 2-digit numbers (up to 99). Some problems involve regrouping, offering students an opportunity to reinforce their subtraction skills and deepen their understanding of place value. Worksheet instructions: Find the missing number in each subtraction problem.

In this worksheet, students practice subtracting a 1-digit number from 2-digit numbers (up to 99). All problems are designed without regrouping, providing students with a chance to strengthen their subtraction skills and number sense. Worksheet instructions: Find the missing number in each problem below.

In this subtraction worksheet, students practice subtracting a 1-digit number from 2-digit numbers (up to 99). All problems are designed without regrouping, providing students with a chance to strengthen their subtraction skills and number sense. Worksheet instructions: Find the missing number in each problem below.

This worksheet helps students practice single-digit subtraction with missing numbers. Excellent for improving subtraction skills. Worksheet instructions: Find the missing number in each equation.

This subtraction worksheet helps students practice single-digit subtraction with missing numbers. It's perfect for building subtraction skills. Worksheet instructions: Find the missing number in each equation.

This worksheet helps students practice single-digit subtraction with missing numbers. It's perfect for building subtraction skills. 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 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.

In this addition worksheet, students practice finding missing numbers in equations with sums up to 100. This worksheet helps reinforce basic addition skills and boosts mental math abilities. Worksheet instructions: Find the missing number in each problem below (no regrouping needed).