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Identify relevant information

Mathematical understanding involves distinguishing the quantities, units, and relationships in a simple situation from descriptive details that do not affect its solution, and identifying which known values and unknown quantity are represented by the question. In one-step addition, subtraction, and comparison situations within 20, this information supports an accurate drawing, equation, or other mathematical model; multi-step problems and more advanced forms of relevance are not included.

Detailed Explanation: Identify relevant information

Before solving a word problem, find the information that helps you answer the question.

Look for:

  • Numbers: What amounts are given?
  • Units: What are you counting, such as apples or stickers?
  • Relationship words: Words like more, fewer, left, or altogether.
  • The question: What do you need to find?

Some details may be interesting but do not change the answer.

Example

Mia has 77 red stickers. She puts 55 more stickers in her blue notebook. How many stickers does Mia have now?

Step 1: Find the known amounts.

Mia starts with 77 stickers and adds 55 stickers.

Step 2: Find the relationship.

The words 55 more” tell us to add.

Step 3: Decide what information is not needed.

The stickers being red and the notebook being blue do not affect how many stickers Mia has.

Step 4: Find what is unknown.

The question asks for the total number of stickers.

Step 5: Make a math model.

7+5=127+5=12

Mia has 12\boxed{12} stickers now.

Learn by doing: Identify relevant information

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Picture Numbers - Subtracting - Picture and Instruction to Word (Within 20)


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