South Carolina Standards & Learning
SC.1.NSBT. Number Sense and Base Ten
1.NSBT.1. Extend the number sequence to:
1.NSBT.1c. Read, write and represent numbers to 100 using concrete models, standard form, and equations in expanded form.
1.NSBT.3. Compare two two-digit numbers based on the meanings of the tens and ones digits, using the words greater than, equal to, or less than.
1.NSBT.4. Add through 99 using concrete models, drawings, and strategies based on place value to:
1.NSBT.4a. Add a two-digit number and a one-digit number, understanding that sometimes it is necessary to compose a ten (regroup).
1.NSBT.6. Subtract a multiple of 10 from a larger multiple of 10, both in the range 10 to 90, using concrete models, drawings, and strategies based on place value.
SC.1.ATO. Algebraic Thinking and Operations
1.ATO.4. Understand subtraction as an unknown addend problem.
1.ATO.6a. Addition and subtraction through 20.