Skills Covered

How to Use This Worksheet

Students examine each fact family triangle showing three related numbers with sums up to 10, then write all four equations. This reinforces the relationship between addition and subtraction.

In the Classroom

Perfect for 1st grade math centers focused on fact families. Students who have mastered sums within 5 are ready to extend to 10. Pair with manipulatives like ten frames for visual support.

At Home

Have your child use ten frames or counters to model each fact family before writing the equations. This concrete-to-abstract approach builds deeper understanding.

Tips for Success

• Encourage students to check each equation by counting on fingers or using counters
• Point out the commutative property in the two addition facts
• Have students circle the largest number in each triangle
• Use the answer key for self-checking

Common Core Standards Alignment

This worksheet supports the following Common Core State Standards for Mathematics:

• 1.OA.B.3 - Apply properties of operations as strategies to add and subtract
• 1.OA.C.6 - Add and subtract within 20, demonstrating fluency within 10
• 1.OA.D.8 - Determine the unknown whole number in an addition or subtraction equation