Completing Fact Families Worksheet by Teach Simple

About this resource

What's inside this resource

This Completing Fact Families Worksheet is a great way for students to practice writing related addition and subtraction equations using the same three numbers. This is a great resource for teachers who want to help their students practice this important skill.

In the classroom

Teaching tips & learning objectives

Learning objectives

Explain how the same three numbers form related addition and subtraction facts.

Teaching tips

Ask students to start with an addition fact and explain how it helps them solve a subtraction fact in the same house.
If a student is stuck, use counters to build the total and separate it into two groups. Connect those groups to the numbers in the house.

Skills covered

Fact-family relationships — connect equations that use the same three numbers.
Missing-number reasoning — use a related fact to find an unknown number.

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Curriculum

Standards, concepts & topics

Standards

1.OA.C.6 — Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e.g., 13 – 4 = 13 – 3 – 1 = 10 – 1 = 9); using the relationship between addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows 12 – 8 = 4); and creating equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13).
1.OA.D.8 — Determine the unknown whole number in an addition or subtraction equation relating three whole numbers. For example, determine the unknown number that makes the equation true in each of the equations 8 + ? = 11, 5 = � – 3, 6 + 6 = �.