1st Grade Math (Oregon Math Standards)

Algebraic Reasoning: Operations (OA)

• 1.OA.A.1 Solve and show real-world addition and subtraction problems within 20, including comparisons, with the unknown anywhere.
• 1.OA.A.2 Solve problems that add three whole numbers totaling 20 or less, using objects, drawings or equations.
• 1.OA.B.3 Use properties of operations to help add and subtract.
• 1.OA.B.4 See subtraction as finding a missing addend.
• 1.OA.C.5 Connect counting to adding and subtracting.
• 1.OA.C.6 Add and subtract within 20, fluent within 10, using accurate, efficient and flexible strategies.
• 1.OA.D.7 Use the meaning of the equal sign to judge whether addition and subtraction equations are true or false.
• 1.OA.D.8 Work out the unknown number in an addition or subtraction equation linking three whole numbers.

Numeric Reasoning: Base Ten Arithmetic (NBT)

• 1.NBT.A.1 Count to 120 from any number below 120, read and write the numerals and use them for groups of objects.
• 1.NBT.B.2 Understand ten as a group of ten ones and two-digit numbers as amounts of tens and ones.
• 1.NBT.B.3 Compare two-digit numbers using tens and ones, recording with >, = and <.
• 1.NBT.C.4 Add within 100 with models and place value strategies, link them to a written method and explain when a ten is made.
• 1.NBT.C.5 Find 10 more or 10 less than a two-digit number in your head, without counting, and explain how.
• 1.NBT.C.6 Subtract multiples of 10 (10–90) with models and place value, linking the strategy to a written method.

Geometric Reasoning and Measurement (GM)

• 1.GM.A.1 Tell defining from non-defining features of shapes and build and draw shapes with the defining ones.
• 1.GM.A.2 Combine flat or solid shapes into composite shapes and make new shapes from them.
• 1.GM.A.3 Cut circles and rectangles into 2 or 4 equal parts and see that more parts means smaller parts.
• 1.GM.B.4 Put three objects in order by length and compare two lengths using a third object.
• 1.GM.B.5 Give an object's length as a whole number of non-standard units laid end to end.
• 1.GM.C.6 Read and write times to the hour and half hour on analog and digital clocks.

Data Reasoning (DR)

• 1.DR.A.1 Ask classroom questions and collect or look at data that can answer them when shown visually.
• 1.DR.B.2 Study data with up to three categories in graphs and charts and interpret it to answer questions.