Which Fact Does Not Belong, Within 100

Before handing out the worksheet, briefly introduce the concept with a short oral warm-up or a visual model on the board. Let students work through it independently after a quick group example, checking in with a partner if they get stuck, encouraging them to talk through their thinking: "What strategy are you using? How do you know that is right?" After completing the worksheet, review any missed problems together and discuss the reasoning rather than just the answer. For extra support, let students use manipulatives or draw pictures alongside the written problems. These fact families worksheets work well as daily practice, homework, or a focused review activity.

Circle the fact that does not belong in 6 fact families within 100 and write the 3 family numbers. A fact family uses the same 3 numbers to make 2 addition facts and 2 subtraction facts. The directions on the page read: Read the 5 facts in each box. Circle the one fact that is not in the fact family. Then, write the 3 numbers of the fact family in the boxes. An answer key is included.

Yes, both. We made it for 2nd Grade fact families, and the page works the same whether it lands on a kitchen table or a center rotation. At home, most families go through it together and talk the answers out loud, and that talking is where most of the learning happens. In class it runs well as independent work while you pull a small group. Print one copy or thirty, whichever the day needs.

A fact family is a set of four related equations using three numbers - for example, 4 + 7 = 11, 7 + 4 = 11, 11 − 7 = 4, and 11 − 4 = 7.

By showing that subtraction undoes addition, fact families allow students to use known addition facts to solve subtraction problems - a key fluency strategy.

Yes - while 2nd grade focuses on addition/subtraction fact families, the same concept extends to multiplication/division families in 3rd grade, making it a durable conceptual framework.

A fact family is a group of related addition and subtraction equations sharing the same three numbers (e.g., 7, 8, 15: 7+8=15, 8+7=15, 15-7=8, 15-8=7). Second graders use fact families to demonstrate understanding of the inverse relationship between addition and subtraction (CCSS 2.OA.B.2) and to derive unknown subtraction facts from known addition facts.

Knowing that 8 + 7 = 15 immediately gives a student 15 - 8 = 7 and 15 - 7 = 8 without additional computation. This think-addition strategy for subtraction is one of the most efficient routes to subtraction fluency within 20 (CCSS 2.OA.B.2). Students who internalize fact families require far less finger-counting for subtraction problems.

Triangle fact family cards (one number in each corner; cover the top number to practice addition, cover a bottom number to practice subtraction) are a classic hands-on tool. Worksheets presenting a triangle with the three numbers and asking students to write all four equations are standard independent practice. Sorting addition and subtraction equations by fact family also builds the concept.