Strand: NUMBER AND OPERATIONS IN BASE TEN (2.NBT)

Understand place value (Standards 2.NBT.1–4). They use place value understanding and properties of operations to add and subtract (Standards 2.NBT.5–9).

Standard 2.NBT.8

Mentally add 10 or 100 to a given number 100-900, and mentally subtract 10 or 100 from a given number 100-900.

• Choral Counting
The teacher will need a 100 chart or large number line and a pointer. As a whole group, have students chant the counting sequence starting with one to thirty, using the pointer to follow the number sequence. Over time, increase the range to one to fifty and then one to one hundred.
• How Many Days Until Summer Vacation?
The purpose of the task is to allow children an opportunity to subtract a three-digit number including a zero that requires regrouping.
• IXL Game: Mixed operations: Addition and Subtraction
This game helps second graders fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction. This is just one of many online games that supports the Utah Math core. Note: The IXL site requires subscription for unlimited use.
• Jamir's Penny Jar
The purpose of this task is to help students articulate their addition strategies as in and would be most appropriately used once students have a solid understanding of coin values. It also provides a context where it makes sense to â€śskip count by 5s and 10sâ€ť for the combinations that involve more than one nickel or dime.
• Making Math Fun with Place Value Games
This lesson shows a game that teaches place value. (7 minutes)
• Many Ways to do Addition 2
The purpose of this task is not to teach or model the addition strategies. Rather the purpose of this task is make explicit different ways students can solve problems so that they will be able to find the most efficient strategy in any given situation and increase their addition fluency.
• Saving Money 1
The purpose of this task is for students to relate addition and subtraction problems to money and to situations and goals related to saving money.
• Toll Bridge Puzzle
This task is intended to assess adding of four numbers as given in the standard while still being placed in a problem-solving context. As written this task is instructional; due to the random aspect regarding when the correct route is found, it is not appropriate for assessment.
• USBE Core Guide for Domain: Number and Operations in Base Ten (2NBT8)
This math guide provides academic vocabulary, instructional strategies, teacher resources, and assessment tasks for the Number and Operations in Base Ten domain.

http://www.uen.org - in partnership with Utah State Board of Education (USBE) and Utah System of Higher Education (USHE).  Send questions or comments to USBE Specialist - Shannon Ference and see the Mathematics - Elementary website. For general questions about Utah's Core Standards contact the Director - DIANA SUDDRETH .
Email:  diana.suddreth@schools.utah.gov

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