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.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.5. Recognize how counting relates to addition and subtraction.
1.ATO.6a. Addition and subtraction through 20.