This activity will help students reflect on the many potential combinations for a number as they work on identifying a missing part of a whole using dots and a word bank.

Complete the number sentence by counting left and right on a number line. Can your child find all the missing numbers?

Count like a champ! Your kid will find missing numbers in no time when he learns how to use a number line. Now get searching!

One way to find the missing number in an equation is to use a number line. Your kid will do just that in this set of addition problems.

Kids practice reverse addition and subtraction to find the missing numbers in this fun 2nd grade math worksheet.

Kids practice reverse addition and subtraction to find the missing numbers in this challenging 2nd grade math worksheet.

Kids practice reverse two-digit addition and subtraction to find the missing numbers in this 2nd grade math worksheet.

Introduce your child to basic algebra with this 2nd grade math worksheet. Kids practice reverse addition or subtraction to find the missing numbers.

Kids get an intro to basic algebra by practicing reverse addition and subtraction to find the missing numbers in this challenging 2nd grade math worksheet.

Kids try their hand at reverse addition and subtraction in order to find the numbers missing from each equation in this 2nd grade math worksheet.

Introduce your child to basic algebra with this 2nd grade math worksheet in which he'll practice reverse addition and subtraction to find the missing numbers.

Kids get a taste of basic algebra in this 2nd grade math worksheet. Kids flip the equations and reverse the operations in order to find the missing number.

Use your addition expertise to find the missing digits in each equation with this second- and third-grade worksheet!

Gain expertise with addition sentences within 20 in this helpful math worksheet!

These equations have lost their signs! Only one sign — plus or minus — can make each equation true.

Explore finding missing starting numbers in addition equations with this engaging hundred-chart worksheet!

Test your addition skills with this hands-on math worksheet!

Test your addition skills with this helpful hundred chart worksheet!

Children complete an addition chart, then fill in missing addends and sums in this useful practice worksheet.

First and second graders will LOVE finding the missing numbers in this adorable Valentine’s Day math puzzle!

Oh no! This toucan is missing his beak. Help finish this picture by skip-counting by seven to connect the dots.

These Christmas presents are missing some color! Challenge your second grader to review addition and subtraction facts by solving the equations in these gifts.

Master two-digit addition with the help of place value charts!

These Christmas presents are missing some color! Challenge your child to review her addition and subtraction math facts by solving the equations in these gifts.

Can your second grader dig a little deeper into number comparisons? Have her find the missing number that makes each "greater than" equation true.

There’s value in adding with place value! Practice using place value charts in this charming second-grade worksheet!

Here's one way to reinforce addition facts and basic math vocabulary. Your child can add up the numbers and fill in missing signs in these addition problems.

Do some Christmas coloring in this addition and subtraction math worksheet. Kids will fill in missing colors in Santa's presents as they solve math problems.