| Code |
Description |
| MAFS.1.NBT.3.4: | Add within 100, including adding a two-digit number and a one-digit
number, and adding a two-digit number and a multiple of 10, using concrete
models or drawings and strategies based on place value, properties of
operations, and/or the relationship between addition and subtraction;
relate the strategy to a written method and explain the reasoning used.
Understand that in adding two-digit numbers, one adds tens and tens, ones
and ones; and sometimes it is necessary to compose a ten. |
| MAFS.1.NBT.3.5: | Given a two-digit number, mentally find 10 more or 10 less than the
number, without having to count; explain the reasoning used. |
| MAFS.1.NBT.3.6: | Subtract multiples of 10 in the range 10-90 from multiples of 10 in the
range 10-90 (positive or zero differences), using concrete models or
drawings and strategies based on place value, properties of operations,
and/or the relationship between addition and subtraction; relate the
strategy to a written method and explain the reasoning used. |
This cluster includes the following access points.
Vetted resources educators can use to teach the concepts and skills in this topic.
| Name |
Description |
| "Cross It Out": | This lesson helps first grade students develop their 'counting on' and 'counting back' strategies. It also lays a strong foundation for working with the base ten system. Teach your students how to play the game "Cross It Out" where they will be able to pick any number on a 120 chart that is greater than 11 and less than 110, and then count on 1 more and 10 more than their number and 1 less and 10 less than their number. Once your students have mastered counting on and counting back and know how to skip count by tens you can introduce this game. |
| Let's Play!: | The fundraiser was a huge success! Now students must decide the best way to spend the money to buy new playground equipment. 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. |
| Finding Ten More and Ten Less with Justen: | In this lesson, students will use manipulatives to decompose two-digit numbers into tens and ones. The students will then find ten more or ten less by adding or subtracting “just ten”. This will also be demonstrated on a hundreds chart. |
| Disappearing Tens: | Students learn to subtract multiples of ten from multiples of ten by playing a game. |
| Adding and Subtracting Ten Challenge: | Students will learn to identify the number that is ten more or ten less than any given two-digit number by playing a game. |
| Adding & Subtracting Ten from Multiples of 10: | In this lesson, students will play a game involving adding ten to, and subtracting ten from, multiples of ten. In the follow-up lesson, Adding and Subtracting Ten Challenge (Resource ID#: 45832), students will use the foundation gained in this lesson to find ten more and ten less than any given two-digit number. |
| Let's Have Fun With Ten More and Ten Less: | In this lesson, students will find ten more and ten less than any given two-digit number on a hundreds chart. They will learn about and identify the patterns that evolve when this task is performed. Then students will mentally find and write ten more and ten less independently. |
| Race to 99: | Students will play a game with tens and ones in a place value chart to ultimately reach 99. Students will physically manipulate unifix cubes or place value blocks to add on one-digit numbers to two-digit numbers, composing new tens when necessary. Students will write equations to represent the addition situations that have been generated. |
| Make a Ten To Make Adding Easy!: | In this lesson students will add two-digit numbers to one-digit numbers by using the "make a ten" strategy. Students will decompose a two-digit number using expanded form, make a ten, and then add. This lesson is an important lesson for students to be able to add greater numbers as they get into higher grade levels. |
| Ten-Hut!: | This lesson allows students to gain insight into how to use place value when adding a two-digit number and a one-digit number. The focus is on students using their bodies, as well as math manipulatives, to solve addition problems within 100 that do not require regrouping. |
| Ten-Hut! Part-2 (Subtraction): | This fun, kinesthetic lesson allows students to gain insight into how to use place value when subtracting a one-digit number from a two-digit number. The focus is on students using their bodies, as well as math manipulatives, to solve subtraction problems within 100 that do not require regrouping. |
| Mentally Adding and Subtracting Ten: | Students will learn strategies to identify ten more and ten less than a given two-digit number. The lesson begins concretely using base-ten blocks, then to the representational using a hundred chart. Ultimately, the lesson moves to the abstract level where students mentally identify ten more and ten less than a given two-digit number. |
Vetted resources students can use to learn the concepts and skills in this topic.
Vetted resources caregivers can use to help students learn the concepts and skills in this topic.
