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Grade 2 Operations and Algebraic Thinking

What your student will learn?

Add and subtract within 100 to solve one- and two-step word problems. (2.OA.1)
 
Quarter 1, 2, and 3
 
Fluently add and subtract within 20 using mental strategies.
By the end of Grade 2, know all sums of two one-digit numbers. (2.OA.2)
 
Quarter 1, 2, 3, and 4
 
Determine odd or even numbers and write an equation to express an even number. (2.OA.3)
 
Quarter 1
 
Use addition to find the total number of objects in rows and columns. (2.OA.4)
 
Quarter 2
 

Vocabulary

  • Addition: To join two or more groups. 2 + 3 = 5
  • Subtraction: To find the difference when two groups are compared or to find out how many are left when items are taken away from a group.
  • Addend: A number that is added to another in an addition problem. In 2 + 3 = 5, 2 and 3 are addends.
  • Difference: The answer to a subtraction problem. In 8 – 3 = 5, 5 is the difference.
  • Sum: The answer to an addition problem. In 2 + 3 = 5, 5 it is the sum.
  • Equal sign (=): A symbol used to show that two amounts have the same value.
    384 = 384
  • Number Sentence: A sentence that includes numbers, operation symbols ( +,- ), and a greater than or less than symbol ( >,< ) or equal sign. 5 + 3 = 8 25 < 32
  • Regroup: To exchange amounts of equal value to rename a number.
  • Decompose: To break a number into smaller parts to simplify computation. Example: 15 = 10 + 5.
  • Compose: To put decomposed numbers back together. 10 + 5 = 15.
  • Array: An arrangement that shows objects in rows and columns.

 

Activities At Home

  • Roll single digit numbers and add them together.
  • Roll 2-digit or 3-digit numbers and add them together.
  • Add all the digits of your house number together.
  • Make a train with Legos or colored blocks. Write a number sentence for the different colors in the train.
  • Represent two digit numbers with popsicle sticks – make bundles of ten for the tens and use single sticks for the ones. Add the piles together.
  • Use small items (counters, beans, small toys) to represent number sentences. Use index cards to make +, -, <, >, and = symbols. Show a number sentence with a missing element: 7 + ___ = 12. Have your student find the missing addend.
  • Add the price of two items at a store.
  • Compare gas prices to find the lowest amount.
  • Roll a 2-digt number and subtract it from 99 or 100.
  • Start with 100 counters (beans, pennies, etc.) and roll two dice to make a 2-digit number. Subtract counters until you get to 0.
  • Give your student an addition or subtraction number sentence and ask them to make up a story problem to go with the number sentence.
  • Look for items that are in repeated sets or groups – panes in a window, pickets on a fence, sodas in a six-pack, wheels on cars or bicycles.
  • Make a physical array with counters and record on paper using symbols.

Learning Links


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Number Puzzles

 
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Grouping in 5's and 10's

 
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Adding on a Number Line
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Even or Odd

 
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Place Value Blocks
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Make Combinations of Ten
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Sum Sense
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Addition and Subtraction Word Problems

 

Basic Fact Practice

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Tom and Jerry Addition

 
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Addition Trimathlon

 
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Subtraction Shoot-Out

 
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Subtraction Harvest

 
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Cone Crazy Subtraction

 
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Snagger's Pond

 
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Subtraction Flashcards

 
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Hidden Picture

 
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Ladybug Subtraction

 
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Minus Mission

 
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Island Chase

 
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Subtraction Machine

 
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Math Magician

 
 
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Math Baseball

 
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Addition Monster

 
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Ghost Blasters 2

 
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Addition is Fun

 
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Addition Surprise

 
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Dinosaur Dentist

 
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Addition Flashcards

2nd Grade Common Core

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