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# Standard #: MA.K.NSO.2.1

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Recite the number names to 100 by ones and by tens. Starting at a given number, count forward within 100 and backward within 20.

### Clarifications

Clarification 1: When counting forward by ones, students are to say the number names in the standard order and understand that each successive number refers to a quantity that is one larger. When counting backward, students are to understand that each succeeding number in the count sequence refers to a quantity that is one less.

Clarification 2: Within this benchmark, the expectation is to recognize and count to 100 by the end of Kindergarten.

### General Information

Subject Area: Mathematics (B.E.S.T.)
Strand: Number Sense and Operations
Status: State Board Approved

• NA

### Vertical Alignment

Previous Benchmarks

Next Benchmarks

### Purpose and Instructional Strategies

The purpose of this benchmark is to deepen student understanding of the counting sequence by 1s and 10s, both forwards and backwards, and to connect the counting sequence to place value. This benchmark will be a foundation as students begin to explore strategies for adding and subtracting. Developing fluency in counting (MTR.3.1) will allow students to use strategies to count on and count back, and fluency counting by 10s will be a foundation in building place value and related addition and subtraction strategies.
• Instruction focuses on building understanding of numbers, not just their conventional names and sequence.
• For example, 11 can be described as 10 and 1; 20 as 2 tens and 80 as 8 tens (MTR.5.1).
• Instruction builds the foundation for students to develop the strategy of counting on and counting back in order to add and subtract (MTR.5.1).
• Students will learn to recognize written numerals from 0 to 100.

### Common Misconceptions or Errors

• Students may have difficulty moving from one group of tens to the next.
• For example, knowing that 30 comes after 29. Students may have to recount by tens to determine the next ten when counting through to 100.
• Students may be confused by the different pattern of word names for the “teens.”

### Strategies to Support Tiered Instruction

• Instruction includes an emphasis on connecting verbal counting with objects. Also counting to give purpose, meaning and to reciting the number sequence while attending to the strategies used to count objects.
• For example, the teacher provides number cards to reinforce the idea that the numbers we say can be represented with symbols and that numbers can be read to express a quantity.
• For example, counting collections of objects and using ten frames to group by tens can help students “see” and give meaning to the patterns found in counting by ones and by tens.

Cut a hundred chart up into irregular shapes along the lines of the rows and columns and have students put it back together in pairs using what they know about place value, patterns, and the concept of one more and one less.

Have students count pennies, both forwards and backwards, as they receive them or give them away.

Looking ahead to MA.1.M.2.3, have students count by tens with dimes.

### Instructional Items

Instructional Item 1

Fill in the missing number or numbers below.

48, 49, ___

73, 74, ___, ___, ___, 78

19, 18, ___, ___

___, ___, 18, 19

Instructional Item 2

Start with 12 counters, then give them away one by one, stating each time how many you have left.

*The strategies, tasks and items included in the B1G-M are examples and should not be considered comprehensive.

#### Related Courses

 Course Number1111 Course Title222 5012020: Grade Kindergarten Mathematics (Specifically in versions: 2014 - 2015, 2015 - 2022, 2022 and beyond (current)) 7712015: Access Mathematics - Grade Kindergarten (Specifically in versions: 2014 - 2015, 2015 - 2018, 2018 - 2022, 2022 and beyond (current)) 5012005: Foundational Skills in Mathematics K-2 (Specifically in versions: 2019 - 2022, 2022 and beyond (current))

#### Related Access Points

 Access Point Number Access Point Title MA.K.NSO.2.AP.1 Express number names from 1 to 100 by ones and from 10 to 100 by tens. Starting at a given number, count forward to 20 and backwards within 10.

#### Formative Assessments

 Name Description Count On Students begin counting at a number other than one. What Day of School Is It? Students are told what day of school it is and then asked to determine what day it will be 10 days later and what day comes after day 59. Count the Candy Corn Students count to 100 by tens. Count By Ones Students count by ones to 45. Counting On Students begin counting at a number other than one. Bundles of Ten Students are asked to count by tens and then use pictures of bundles of tens to demonstrate when counting by tens. Apples in a Bag Students are asked to consider what number comes next in the known sequence. Counting Strategies Students are asked to determine the total number of counters in three bags. One of the three bags is labeled with the number of items it contains, and the total number of counters is less than 20. Count the Dots Game Students use ten frames to Count On from a number other than one.

#### Original Student Tutorials

 Name Description Hopscotch Counting On: 11-20 Count on beginning at any number within 11-20 in this playground-themed, interactive tutorial. This is part 2 in a two-part series. Click to open Part 1, Hopscotch Counting On: 1-10. Hopscotch Counting On: 1-10 Count on beginning at any number within 1-10 in this interactive tutorial. Counting on by Ones When Given Any Number From 0 through 20 Practice counting on by ones from a given number zero through twenty, as you help Miranda and Jacob in this interactive tutorial. Counting by Ones Join Thomas and count to twenty by ones in this interactive tutorial. I Can Count... By Ones to Ten Learn to count to ten by ones with this interactive tutorial.

#### Original Student Tutorials

 Name Description Hopscotch Counting On: 11-20: Count on beginning at any number within 11-20 in this playground-themed, interactive tutorial. This is part 2 in a two-part series. Click to open Part 1, Hopscotch Counting On: 1-10. Hopscotch Counting On: 1-10: Count on beginning at any number within 1-10 in this interactive tutorial. Counting on by Ones When Given Any Number From 0 through 20: Practice counting on by ones from a given number zero through twenty, as you help Miranda and Jacob in this interactive tutorial. Counting by Ones: Join Thomas and count to twenty by ones in this interactive tutorial. I Can Count... By Ones to Ten: Learn to count to ten by ones with this interactive tutorial.

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