2nd Grade Math (Maryland MCCRS)

Number and Operation Sense – 2.NOS.A: Place value and representing numbers

• 2.NOS.A.1 Understand 100 as ten tens (one hundred) and compose and decompose three-digit numbers.
  • a. Break numbers into hundreds, tens and ones with objects, drawings or equations.
  • b. Describe a number as so many hundreds, tens and ones.
  • c. Compose and decompose numbers in more than one way.
• 2.NOS.A.2 Count forward and backward within 1000 from any number and skip count, including to total arrays.
  • a. Skip count by 2s, 5s, 10s and 100s.
  • b. Skip count to find the total of an array with up to 5 rows and 5 columns.
• 2.NOS.A.3 Read and write numbers to 1000 as numerals, number names and expanded form.
• 2.NOS.A.4 Compare two three-digit numbers using place value and/or number line position; record with >, = and <.
• 2.NOS.A.5 Estimate using number line positions and benchmarks, and judge whether sums and differences are reasonable.

Number and Operation Sense – 2.NOS.B: Add and subtract within 20

• 2.NOS.B.6 Recall or quickly work out addition and subtraction facts within 20.
  • a. Use counting on, making ten, ten more or less and doubles.
  • b. Use make-ten and doubles-plus-one strategies.
  • c. Use the inverse relationship between addition and subtraction.

Number and Operation Sense – 2.NOS.C: Representations, place value and properties to add and subtract

• 2.NOS.C.7 Show sums and differences of whole numbers within 100 as lengths on a number line.
• 2.NOS.C.8 Add and subtract fluently within 100 with counting, place value, properties and inverse operations.
  • a. Use counting-based and place value strategies.
  • b. Use properties of operations and the inverse relationship.
  • c. Choose the most efficient strategy and explain why.
• 2.NOS.C.9 Add and subtract within 1000 by combining like place values, composing or decomposing tens and hundreds as needed.
  • a. Use concrete models or drawings.
  • b. Use place value strategies.
  • c. Use properties of operations and the inverse relationship.
  • d. Explain the calculation by linking the strategy to the meaning of addition or subtraction.
• 2.NOS.C.10 Mentally add or subtract 10 or 100 to or from a number between 100 and 900.

Number and Operation Sense – 2.NOS.D: Equal parts of a whole

• 2.NOS.D.11 Split circles and rectangles into equal halves, thirds or fourths and count the shares that make a whole.

Algebraic Thinking – 2.AT.A: Addition and subtraction problems

• 2.AT.A.1 Solve one-step addition and subtraction word problems within 100 with the unknown in any position, using models and symbols.
• 2.AT.A.2 Solve two-step addition and subtraction word problems within 100 with the unknown in any position, using models and equations.

Algebraic Thinking – 2.AT.B: Patterns in numbers

• 2.AT.B.3 Decide whether a group of up to 20 objects is odd or even and write an even number as a sum of two equal addends.

Geometric Reasoning and Measurement – 2.GR.A: Measure and estimate length in standard units

• 2.GR.A.1 Measure the length of an object to the nearest whole unit with a suitable tool.
• 2.GR.A.2 Measure one object with two different units and explain how the results relate to unit size.
• 2.GR.A.3 Estimate lengths in inches, feet, centimeters and meters.
• 2.GR.A.4 Measure to find how much longer one object is than another in a standard unit.

Geometric Reasoning and Measurement – 2.GR.B: Shapes and their attributes

• 2.GR.B.5 Recognize and draw triangles, quadrilaterals, pentagons, hexagons and cubes with given attributes.
• 2.GR.B.6 Explain what a line of symmetry is, identify line-symmetric figures and draw their lines of symmetry.

Geometric Reasoning and Measurement – 2.GR.C: Time and money

• 2.GR.C.7 Tell and show time to the nearest minute on digital and analog clocks and on number lines.
• 2.GR.C.8 Estimate and calculate elapsed time in whole and half hours.
• 2.GR.C.9 Count mixed coins and bills up to $20.00 to solve problems, using the $ and ¢ symbols correctly.

Reasoning with Data and Statistics – 2.DS.A: Represent and interpret data

• 2.DS.A.1 Ask and answer questions by collecting, organizing and summarizing categorical and numerical data.
  • a. Write a question that categorical or numerical data can answer.
  • b. Collect and organize data through surveys, observation or measuring.
  • c. Show categorical data in picture and bar graphs and numerical data in line plots.
  • d. Summarize the data and decide which questions it can answer.