  # South Carolina - Grade 1 - Math - Number Sense and Base Ten - Tens & Ones - 1.NSBT.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 - South Carolina
• Standard ID - 1.NSBT.2
• Subjects - Math Common Core

### Keywords

• Math
• Number Sense and Base Ten

## More South Carolina Topics Solve real-world/story problems that include three whole number addends whose sum is less than or equal to 20. 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. 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. 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. Order three objects by length using indirect comparison.

## Here is the skill that South Carolina requires you to master

• State Test SC CCRS
• State Standards South Carolina College- and Career-Ready Standards
• Subject Math
• Topic Name Tens & Ones
• Standard ID 1.NSBT.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).  