  # Montana - Grade 1 - Math - Numbers and Operations in Base Ten - Tens & Ones - 1.NBT.2

### Description

Understand that the two digits of a two-digit number represent amounts of tens and ones. Understand the following as special cases: A. 10 can be thought of as a bundle of ten ones — called a “ten.” B. The numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six, seven, eight, or nine ones. C. The numbers 10, 20, 30, 40, 50, 60, 70, 80, 90 refer to one, two, three, four, five, six, seven, eight, or nine tens (and 0 ones).

• State - Montana
• Standard ID - 1.NBT.2
• Subjects - Math Common Core

### Keywords

• Math
• Numbers and Operations in Base Ten

## More Montana Topics Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used. Apply properties of operations as strategies to add and subtract.2 Examples: If 8 + 3 = 11 is known, then 3 + 8 = 11 is also known. (Commutative property of addition.) To add 2 + 6 + 4, the second two numbers can be added to make a ten, so 2 + 6 + 4 = 2 + 10 = 12. (Associative property of addition.) Solve word problems that call for addition of three whole numbers whose sum is less than or equal to 20, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem. Count to 120, starting at any number less than 120. In this range, read and write numerals and represent a number of objects with a written numeral. Compare two two-digit numbers based on meanings of the tens and ones digits, recording the results of comparisons with the symbols >, =, and <.

## Here is the skill that Montana requires you to master

• State Test Smarter Balanced Assessments
• State Standards Montana Common Core Standards
• Subject Math
• Topic Name Tens & Ones
• Standard ID 1.NBT.2
• Description
Understand that the two digits of a two-digit number represent amounts of tens and ones. Understand the following as special cases: A. 10 can be thought of as a bundle of ten ones — called a “ten.” B. The numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six, seven, eight, or nine ones. C. The numbers 10, 20, 30, 40, 50, 60, 70, 80, 90 refer to one, two, three, four, five, six, seven, eight, or nine tens (and 0 ones).  