Cluster 3: Add and subtract within 20. (Major Cluster)Archived

Dive deep with this fun subtraction facts game. Correctly answer the math facts and capture pictures of sea creatures! Choose to focus on one fact family or practice them all!

Type: Educational Game

"This game gives children practice with adding and subtracting ones and tens. Using a special die, two 0 99 charts, and two markers, children play in pairs. During the course of a game, they calculate between 20 and 30 addition and subtraction problems." (from Math Solutions Professional Development)

Type: Educational Game

This interactive Flash applet helps children learn grouping, tally marks, place value, addition, and subtraction. Students help the alien spaceship move cows into corrals by counting by 5s and 10s. They also can apply those grouping skills to practice adding and subtracting two-digit numbers with regrouping. Audio cues and prompts reinforce the user's actions and facilitate counting and the development of math language.

Type: Educational Software / Tool

A printable hundreds chart featuring a 10x10 table numbered 1 to 100. (found on Illuminations website under "Trading for Quarters")

Type: Educational Software / Tool

Students solve two problems, each in more than one way, and are encouraged to use more sophisticated strategies.

Type: Formative Assessment

Students use a counting strategy to find the difference between two numbers.

Type: Formative Assessment

Students are encouraged to use more sophisticated strategies to solve a part-part-whole problem.

Type: Formative Assessment

Students are encouraged to use Counting On to solve Add To (Result Unknown) word problems.

Type: Formative Assessment

Students solve addition and subtraction problems by making tens, using a known fact, and by using a subtraction fact.

Type: Formative Assessment

Students are asked to write equations that correspond to counting strategies used in word problems.

Type: Formative Assessment

Students solve an addition and a subtraction problem in more than one way.

Type: Formative Assessment

Students are guided to use counting to find the sum of two numbers.

Type: Formative Assessment

The learner will relate counting to addition and subtraction by using the strategies "Counting Up" and "Counting Down". This lesson engages students through the use of short videos, manipulatives, literature, and games

Type: Lesson Plan

Students will listen to the book, Quack and Count by Keith Baker, and use the information in the book along with manipulatives to create addition equations. Students will then relate the addition equation to a subtraction equation. Specifically, students will be working on creating the addition and related subtraction facts with the number combinations for 7.

Type: Lesson Plan

This project is to be used at the end of the school year once all the addition and subtraction strategies have been taught. This is a review of the strategies and is an excellent way for students to show what they know about their understanding of addition and subtraction strategies.

Type: Lesson Plan

This lesson will teach students a strategy to subtract one-digit numbers from teen numbers by thinking addition and making-a-ten using double ten frames and two-color counters. This lesson supports previous work with restating subtraction problems as missing addend problems.

Type: Lesson Plan

This STEAM (Science, Technology, Engineering, Art, and Math) lesson has been designed around a Model-Eliciting Activity.

The Flower Power MEA provides students with an real world problem in which they must work as a team to design a plan to select the best flower arrangement for a special event. The resource was primarily designed as an MEA so the time and teacher instructions are based on the MEA format. The additional activities will take several hours of instruction but include watching and discussing a video about the parts of plants, reading a book, and discussing the art in the book as well as additional art by the book author/illustrator.

Model Eliciting Activities, MEAs, are open-ended, interdisciplinary problem-solving activities that are meant to reveal students’ thinking about the concepts embedded in realistic situations. Click here to learn more about MEAs and how they can transform your classroom.

Type: Lesson Plan

In this lesson, students will apply properties of addition in order to add three whole numbers. Students will then decompose the sum using tens and ones.

Type: Lesson Plan

In this lesson, students will use the "make-a-ten" strategy to add two whole numbers within 20. Students will utilize a ten frame and 2-color counters to complete this activity.

Type: Lesson Plan

In this open-ended question, students in teams will make decisions about how to rank vegetables to plant on a farm. The students' decisions will be based on various criteria.

Model Eliciting Activities, MEAs, are open-ended, interdisciplinary problem-solving activities that are meant to reveal students’ thinking about the concepts embedded in realistic situations. MEAs resemble engineering problems and encourage students to create solutions in the form of mathematical and scientific models. Students work in teams to apply their knowledge of science and mathematics to solve an open-ended problem, while considering constraints and tradeoffs. Students integrate their ELA skills into MEAs as they are asked to clearly document their thought process. MEAs follow a problem-based, student centered approach to learning, where students are encouraged to grapple with the problem while the teacher acts as a facilitator. To learn more about MEA’s visit: https://www.cpalms.org/cpalms/mea.aspx

Type: Lesson Plan

This lesson outlines a game that is a fun and engaging to practice the make a ten strategy, within 20.

Type: Lesson Plan

In this lesson, students will play a card game to practice finding pairs of numbers that make 10 when added.

Type: Lesson Plan

Students will be able to describe how adding by one is like counting up or on.

Type: Lesson Plan

In this lesson, students will learn how to use their knowledge of beginning, middle, and end to solve word problems that include result unknown, change unknown, and start unknown. They will learn how to use a modified story map to write an equation to represent the problem.

Type: Lesson Plan

This lesson teaches students to use the strategy doubling numbers and doubles plus or minus one in order to use mental math to add one-digit numbers. The students are engaged in learning through the read-aloud of "Double the Ducks" by Stephen Murphy and then get to work with a partner to draw doubles and write equations that relate to their drawings. Students individually work on solving word problems using these strategies and manipulatives as necessary to solve.

Type: Lesson Plan

The language for this task is written above a 1st grade reading level, so it will need to be introduced verbally by the teacher. This problem helps students to practice adding three numbers whose sum are 20 or less. It is an open-ended problem with many solutions.

Type: Problem-Solving Task

This task is designed to help students visualize where the 10's are on a single digit addition table and explain why this is so. This knowledge can then be used to help them learn the addition table.

Type: Problem-Solving Task

This article proposes a structured set of lively, brief, daily exercises designed to help children master number facts and mental math skills. Each day's practice focuses on a small, highly focused, manageable, and strategically selected set of facts or skills that builds directly on the previous days' learning. Related resources (Practice and videos) are cataloged separately.

Type: Teaching Idea

In this tutorial, you will learn how to add 7 + 6 using a number line and objects to count.

Type: Tutorial

Type: Tutorial

Using a five-frame as a model, you will learn how to use equations to join two addends, to make 5.

Type: Tutorial

In this tutorial, you will learn to find the unknown change in an equation with a sum of 10: 3 + ? = 10.

Type: Tutorial

This interactive game allows students to review math concepts, including shapes, shape names, addition, multiplication, negative numbers, and equivalent expressions.

Type: Virtual Manipulative