In this worksheet, students use the hundreds chart to crack the code and find the hidden treasure.

Kids practice finding the hidden number sentences that make up a fact family. See how many you can find!

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.

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

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.

This first grade subtraction worksheet will help improve your child's math skills, while giving him a fun riddle to solve.

Crack the code of the missing starting number with this investigative subtraction worksheet!

Show off your skills with subtraction strategies in this helpful worksheet!

Your child will enjoy cutting and pasting while solving problems to fill in the missing information.

Find the missing digits in the following problems!

Find the facts within the number triangles in this engaging subtraction worksheet!

Use addition and subtraction to find the correct path through the puzzle.

In this math exercise, have your students find the difference by using regrouping.

In this worksheet, first graders are challenged to complete each subtraction equation by working backwards!

Practice using ten frames to find missing numbers with this friendly subtraction worksheet!

Subtract the numbers to find the difference, then color code the answer for odd or even.