### The resources above correspond to the standards listed below:

#### Florida Standards

FL.MAFS.1.OA. OPERATIONS AND ALGEBRAIC THINKING
MAFS.1.OA.2. Understand and apply properties of operations and the relationship between addition and subtraction.
MAFS.1.OA.2.4. Understand subtraction as an unknown-addend problem. For example, subtract 10 – 8 by finding the number that makes 10 when added to 8.
MAFS.1.OA.3. Add and subtract within 20.
MAFS.1.OA.3.5. Relate counting to addition and subtraction (e.g., by counting on 2 to add 2).
MAFS.1.OA.3.6. Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e.g., 13 – 4 = 13 – 3 – 1 = 10 – 1 = 9); using the relationship between addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows 12 – 8 = 4); and creating equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13).
FL.MAFS.1.NBT. NUMBER AND OPERATIONS IN BASE TEN
MAFS.1.NBT.2. Understand place value.
MAFS.1.NBT.2.2. Understand that the two digits of a two-digit number represent amounts of tens and ones.
MAFS.1.NBT.2.2.d. Decompose two-digit numbers in multiple ways (e.g., 64 can be decomposed into 6 tens and 4 ones or into 5 tens and 14 ones).
MAFS.1.NBT.3. Use place value understanding and properties of operations to add and subtract. (Additional Cluster)
MAFS.1.NBT.3.4. 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.