1st Grade Math (Montana Content Standards)

Operations and Algebraic Thinking (OA)

• MT.1.OA.1 Solve every type of add and subtract problem within 20, including Montana cultural contexts.
• MT.1.OA.2 Solve problems in context that add three whole numbers with a total up to 20.
• MT.1.OA.3 Build and break apart numbers flexibly to add and subtract.
• MT.1.OA.4 Understand subtraction as finding an unknown addend.
• MT.1.OA.5 Link counting to adding and subtracting.
• MT.1.OA.6 Add and subtract within 10 flexibly, accurately and efficiently.
• MT.1.OA.7 Use several strategies to add and subtract within 20.
• MT.1.OA.8 Understand the equal sign and decide if equations are true or false.
• MT.1.OA.9 Find the unknown number in a three-number addition or subtraction equation.

Number and Operations in Base Ten (NBT)

• MT.1.NBT.1 Count to 120 and read, write and model numbers in that range.
• MT.1.NBT.2 Understand ten as a unit of ten ones and two-digit numbers as tens and ones.
• MT.1.NBT.3 Compare two-digit numbers using >, = and <.
• MT.1.NBT.4 Add a two-digit and a one-digit number, and a multiple of 10 to a two-digit number.
• MT.1.NBT.5 Use place value to find 10 more or 10 less than a two-digit number.
• MT.1.NBT.6 Take multiples of ten away from 2-digit numbers.

Measurement and Data (MD)

• MT.1.MD.1 Order three objects by length and compare two using a third.
• MT.1.MD.2 Measure length as a whole number of same-size units with no gaps or overlaps.
• MT.1.MD.3 Tell and write time to the hour and half hour on analog and digital clocks.
• MT.1.MD.4 Know the value of coins.
• MT.1.MD.5 Sort, show and talk about data in as many as three categories.

Geometry (G)

• MT.1.G.1 Tell defining attributes of shapes from non-defining ones.
• MT.1.G.2 Build and draw shapes that have given defining attributes.
• MT.1.G.3 Make new shapes from 2D and 3D shapes.
• MT.1.G.4 Split circles and rectangles into halves, fourths and quarters.