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?

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.

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.

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.

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.

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.

There are 10 gifts under the Christmas tree, but they're missing their colors. Your child will use his math and creative skills to color them in this worksheet.

Shape up your addition skills with these square puzzles!

Is your child comfortable with adding double-digit numbers? If he's getting there here's a different take on addition problems!

Children skip count by threes to connect the dots and discover the hidden picture.

Add some color to these Christmas presents in this color-by-number mental math worksheet. Kids will exercise addition and subtraction skills.

Your young learner can have a blast experimenting with addition facts in the Math Lab!

Your child can exercise addition and subtraction skills at Christmas time with this mental math worksheet. It also includes a bonus coloring exercise.

Make the math concept "less than" more clear with a colorful worksheet that gets him practicing with number comparisons to make each equation true.

Challenge your third grader to figure out the addition and subtraction patterns on this worksheet.