1st Grade Math (South Dakota Content Standards)

Operations and Algebraic Thinking (OA)

• 1.OA.1 Solve add and subtract story problems within 20 of every type (joining, separating, part-whole, comparing) with the unknown anywhere.
• 1.OA.2 Solve word problems that add three whole numbers with a total of 20 or less.
• 1.OA.3 Use the commutative, associative and identity properties as strategies to add.
• 1.OA.4 Understand subtraction as finding an unknown addend.
• 1.OA.5 Understand counting on as adding and counting back as subtracting.
• 1.OA.6 Add and subtract within 20, fluent within 10, using strategies such as making ten.
• 1.OA.7 Understand the equal sign and decide if addition and subtraction equations are true or false.
• 1.OA.8 Find the missing whole number that makes an addition or subtraction equation true.

Number and Operations in Base Ten (NBT)

• 1.NBT.1 Extend the counting sequence to 120.
  • 1.NBT.1a Count on from any given number.
  • 1.NBT.1b Read and write numerals.
  • 1.NBT.1c Write the numeral that matches a set of objects.
• 1.NBT.2 Understand that a 2-digit number's digits mean tens and ones.
  • 1.NBT.2a See ten ones grouped together as one ten.
  • 1.NBT.2b See 11–19 as a ten and some ones.
  • 1.NBT.2c See 10, 20 … 90 as that many tens and no ones.
• 1.NBT.3 Compare two-digit numbers using <, = and >.
• 1.NBT.4 Add within 100, understanding when a ten must be made.
  • 1.NBT.4a Add a 2-digit number to a 1-digit number or a multiple of 10 with place value and strategies.
  • 1.NBT.4b Add tens to tens and ones to ones, making a ten when needed.
• 1.NBT.5 Find 10 more or 10 less than a two-digit number mentally.
• 1.NBT.6 Subtract multiples of ten in the range 10–90, using strategies and explaining them.

Measurement and Data (MD)

• 1.MD.1 Order three objects by length and compare two lengths using a third object.
• 1.MD.2 Give length as a whole number of units laid end to end with no gaps or overlaps.
• 1.MD.3 Tell and write time to the hour and half hour on analog and digital clocks.
• 1.MD.4 Sort, show and talk about data in as many as three categories.
• 1.MD.5 South Dakota addition: identify nickels and dimes and count pennies, nickels and dimes by value. (being checked)

Geometry (G)

• 1.G.1 Tell defining from non-defining attributes and build and draw shapes with defining attributes.
• 1.G.2 Identify regular and irregular 2D and 3D shapes and combine them into composite shapes.
• 1.G.3 Split circles and rectangles into halves and fourths, using those words.