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How to learn Grade 2: Mathematics

Oregon academic standards: Mathematics, Grade 2

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1. Grade 2 · Analyze, represent, and interpret data.

  1. Sorting into categories (age 6+): Interpret categorical data by asking and answering questions about totals, how many in each category, and how many more or less one category has than another

2. Grade 2 · Work with time and money.

  1. Halves and quarters (age 7+): Solve word problems involving dollar bills, quarters, dimes, nickels, and pennies, using $ and ¢ symbols appropriately
  2. Telling time to the minute (age 7+): Tell and write time from analogue and digital clocks to the nearest five minutes, using a.m., p.m., and 12-hour and 24-hour notation

3. Grade 2 · Relate addition and subtraction to length.

  1. Numbers on a number line: Represent whole numbers as lengths on a number line and represent sums and differences within 100 on a number line diagram
  2. Addition and subtraction word problems: Solve word problems involving lengths within 100, using addition and subtraction with drawings and equations

4. Grade 2 · Measure and estimate lengths in standard units.

  1. Measuring length (age 6+): Measure the length of an object using same-size length units laid end to end with no gaps or overlaps
  2. Measuring length (age 7+): Measure the length of an object by selecting and using appropriate tools such as rulers, yardsticks, metre sticks, and measuring tapes
  3. Comparing lengths by measuring: Measure to determine how much longer one object is than another, expressing the length difference in terms of a standard length unit
  4. Measuring with different units: Measure the length of an object using two different length units and describe how the measurements relate to the size of the unit chosen
  5. Estimating Lengths: Estimate lengths using units of inches, feet, centimetres, and metres

5. Grade 2 · Reason with shapes and their attributes.

  1. Splitting shapes into equal parts (age 7+): Partition circles and rectangles into two, three, or four equal shares; describe shares as halves, thirds, and fourths; recognise that equal shares of identical wholes need not have the same shape
  2. Rows & Columns in Rectangles: Partition a rectangle into rows and columns of same-size squares and count to find the total number of them
  3. Understanding angles: Recognise angles as a property of shape or a description of a turn

6. Grade 2 · Use place value understanding and properties of operations to add and subtract.

  1. Fluent adding and subtracting within 100: Fluently add and subtract within 100 using strategies based on place value, properties of operations, and the relationship between addition and subtraction
  2. Addition and subtraction strategies (age 7+): Explain why addition and subtraction strategies work, using place value and the properties of operations
  3. Place value understanding and number facts: Use place value understanding and number facts to solve problems
  4. Addition and subtraction within 1000: Add and subtract within 1000 using concrete models, drawings, and strategies based on place value; understand composing and decomposing tens and hundreds
  5. Adding numbers: Add up to four two-digit numbers using strategies based on place value and properties of operations

7. Grade 2 · Understand place value.

  1. Comparing and ordering numbers: Compare and order two-digit numbers using the symbols >, =, and <, based on place value understanding
  2. A Hundred Is Ten Tens: Understand that 100 can be thought of as a bundle of ten tens — called a 'hundred'
  3. The three digits of a three-digit number: Understand that the three digits of a three-digit number represent amounts of hundreds, tens, and ones
  4. Ordering Numbers to 1000: Compare and order numbers up to 1000 using >, =, and < symbols, based on place-value understanding
  5. Reading and writing numbers (age 9+): Read, write, order, and compare whole numbers up to at least 1,000,000 using base-ten numerals, number names, expanded form, and place-value understanding
  6. Counting in 2s: Count in multiples of 2, 5, and 10 (skip counting)
  7. The multiples of 100: Understand that the multiples of 100 (100–900) each represent a number of hundreds with 0 tens and 0 ones

8. Grade 2 · Work with equal groups of objects to gain foundations for multiplication.

  1. Arrays for multiplication (age 7+): Use addition to find the total number of objects arranged in rectangular arrays with up to 5 rows and 5 columns; write an equation to express the total as a sum of equal addends
  2. Odd or Even: Determine whether a group of objects (up to 20) has an odd or even number of members

9. Grade 2 · Represent and solve problems involving addition and subtraction.

  1. Two-Step Word Problems: Solve one- and two-step word problems within 100 using addition and subtraction, with unknowns in all positions
  2. Two-step addition and subtraction problems: Solve addition and subtraction two-step problems in contexts, deciding which operations and methods to use and why