Strand: NUMBER AND OPERATIONS IN BASE TEN (1.NBT)

Extend the counting sequence (Standard 1). Understand place value (Standards 2–3). Use place value understanding and properties of operations to add and subtract (Standards 4–6).

Standard 1.NBT.5

Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used.

• Grade 1 Unit 5: Understanding Place Value (Georgia Standards)
In this unit, students will understand the order of the counting numbers and their relative magnitudes, use a number line and 99 chart to build understanding of numbers and their relation to other numbers, unitize a group of ten ones as a whole unit: a ten, and understand that a group of ten pennies is equivalent to a dime.
• Great Modeling Tasks in Three Acts - Thirsty Values
Students are going to discover how many CapriSun pouches are left on the table using place value.
• Number and Operations in Base Ten (1.NBT) - First Grade Core Guide
The Utah State Board of Education (USBE) and educators around the state of Utah developed these guides for First Grade Mathematics - Number and Operations in Base Ten (1.NBT)
• Number Square
This task describes an extended instructional sequence whose purpose is to use the 1-100 number square (also called a hundreds chart) to support understanding of adding and subtracting ten from a two-digit number.

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 Olson and see the Mathematics - Elementary website. For general questions about Utah's Core Standards contact the Director - Jennifer Throndsen .

These materials have been produced by and for the teachers of the State of Utah. Copies of these materials may be freely reproduced for teacher and classroom use. When distributing these materials, credit should be given to Utah State Board of Education. These materials may not be published, in whole or part, or in any other format, without the written permission of the Utah State Board of Education, 250 East 500 South, PO Box 144200, Salt Lake City, Utah 84114-4200.