By the end of grade one, students understand and use the concept of ones and tens in the place value number system. Students add and subtract small numbers with ease. They measure with simple units and locate objects in space. They describe data and analyze and solve simple problems.

• 1.0 Students use number sentences with operational symbols and expressions to solve problems:
  

  1.1 Write and solve number sentences from problem situations that express relationships involving addition and subtraction.

  1.2 Understand the meaning of the symbols +, -, =.

  1.3 Create problem situations that might lead to given number sentences involving addition and subtraction.

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