3.NBT.2:
Number And Operations In Base Ten
Use Place Value Understanding And Properties Of Operations To Perform Multi-Digit Arithmetic
Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations, and-or the relationship between addition and subtraction.
3.OA.9:
Operations And Algebraic Thinking
Solve Problems Involving The Four Operations, And Identify And Explain Patterns In Arithmetic.
Identify arithmetic patterns (including patterns in the addition table or multiplication table), and explain them using properties of operations. For example, observe that 4 times a number is always even, and explain why 4 times a number can be decomposed into two equal addends.
3.NF.3:
Number And Operations - Fractions
Develop Understanding Of Fractions As Numbers.
Explain equivalence of fractions in special cases, and compare fractions by reasoning about their size.
3.MD.7:
Measurement And Data
Geometric Measurement: Understand Concepts Of Area And Relate Area To Multiplication And To Addition.
Relate area to the operations of multiplication and addition.
