1st Grade Math (Ohio's Learning Standards)

Operations and Algebraic Thinking (1.OA)

• 1.OA.1 Solve word problems within 20 about adding to, taking from, putting together, taking apart and comparing, with the unknown anywhere.
• 1.OA.2 Solve word problems that add three whole numbers with a sum of 20 or less, using drawings or equations.
• 1.OA.3 Use the commutative and associative properties of addition as strategies to add and subtract.
• 1.OA.4 Understand subtraction as finding an unknown addend.
• 1.OA.5 Relate counting to addition and subtraction, e.g. counting on 2 to add 2.
• 1.OA.6 Add and subtract within 20 with flexible strategies such as making ten and using known facts.
• 1.OA.7 Explain what the equal sign means and decide whether addition and subtraction equations are true or false.
• 1.OA.8 Find the unknown whole number that makes a three-number addition or subtraction equation true.

Number and Operations in Base Ten (1.NBT)

• 1.NBT.1 Count to 120 from any number below 120 and read, write and match numerals to objects.
• 1.NBT.2 Understand two-digit numbers as tens and ones, including 11–19 as a ten and some ones.
• 1.NBT.3 Compare two-digit numbers using tens and ones and record with >, = and <.
• 1.NBT.4 Add within 100 (two-digit plus one-digit or plus a multiple of ten) with models or strategies and explain.
• 1.NBT.5 Mentally find 10 more or 10 less than a two-digit number without counting and explain.
• 1.NBT.6 Subtract multiples of 10 from 10–90 using models, place value or related addition.

Measurement and Data (1.MD)

• 1.MD.1 Order three objects by length and compare two lengths indirectly using a third object.
• 1.MD.2 Measure length by laying copies of a shorter unit end to end with no gaps or overlaps.
• 1.MD.3 Work with time and money.
  • a. Tell and write time in hours and half hours on analog and digital clocks.
  • b. Identify pennies and dimes by name and value.
• 1.MD.4 Organize and interpret data with up to three categories and answer questions about totals and differences.

Geometry (1.G)

• 1.G.1 Tell defining from non-defining attributes of shapes and build and draw shapes with given attributes.
• 1.G.2 Compose 2D or 3D shapes into composite shapes and make new shapes from them.
• 1.G.3 Split circles and rectangles into halves or fourths and see that more equal shares are smaller.