**Practice identifying numbers one more or one less than a given two-digit number with this set of 20 task cards.**

If you’re looking for one activity for your students to practice:

Addition ✔️

Subtraction ✔️

Counting by 1✔️

Writing numbers ✔️

Pattern recognition ✔️

It’s all here in our *What’s Missing?* Task Cards.

Through this algebraic thinking activity, students will show they can count forward and backward from a given number within a sequence, instead of starting at 1.

**Practice Number Patterns & Counting By 1**

Use this resource in your math center, guided small group, or with your whole class (see below) to practice identifying the missing number that is either one more or one less, up to 99.

Students will review each of the task cards and write the missing numbers from the patterns in their corresponding space on the recording sheet.

**Scaffolding + Extension Tips **

Challenge students who already understand the concept to either add one or subtract one from the opposite end of the task card.

Support students who need help understanding the concepts by using a hundreds chart or number line as a visual reference.

Get our 10 Best Scaffolding Strategies here!

**More Ways To Use This Counting By 1 Activity! **

Use this resource as independent practice for fast finishers and full-class learning opportunities like scoot activities, lesson reviews, formative assessments, and more.

**🛴 Scoot Activity**

Hang all 20 cards around the room in order and provide students with a recording sheet. Working either alone or in pairs, assign a task card to each to start, and have them rotate around the cards (on your signal), writing their answers on the recording sheet.

**☀️ Warm-Up/Exit Activity**

Either before or after your math lesson, ask students to select a task card from the deck. Have them write their card number (1-20) and their name in the top corner of a sticky note, and finish the sequence by writing the missing number. Use our simple sticky note printing template to make this assessment a snap!

**👯♀️ Mirror Game**

This activity is a spin on the classic “Newlywed Game” and works best with small groups because you’ll need enough dry erase boards and markers for each student. Divide the students into 2 groups, and have them sit in 2 lines facing each other. Project a task card and give students 10 seconds to complete the sequence on their board. On your cue, the students turn their boards around so their partner can see their answers. If both students in a pair have the correct answer, they get 2 points. If one has the correct answer, the team gets 1 point.

**Easily Prepare This Resource for Your Students**

Print on cardstock for added durability and longevity. Place all pieces in a folder or large envelope for easy access.

Keep the task cards out of pockets or under desks: cut out the cards and punch a hole in the corner of each to place them on a binder ring.

To turn this teaching resource into a sustainable activity, print a few recording sheets on cardstock and slip them into dry-erase sleeves. Students can record their answers with a dry-erase marker, then erase and reuse.

**Before You Download**

Use the dropdown icon on the Download button to choose between the PDF or Google Slides version of this resource. A recording sheet and answer key are also included with this download.

This resource was created by Allie Kleijnjans, a teacher in Pennsylvania and Teach Starter Collaborator.

Take your math lessons to the next level with even more counting activities:

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Identify one more or one less of a given 2-digit number with this set of 36 match up cards.

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#### One More, One Less Worksheet

Practice foundational addition and subtraction facts using the concepts of one more and one less.

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#### Missing Numbers – Task Cards

Practice counting by 1s forward and backward by completing number sequences with this set of 12 task cards.

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