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Curriculum › Math ›Grade 2

Grade 2 Math · Level 6, Enrichment + Grade-3 Prep

Number Constraint Challenges

Use several number clues at once to determine which numbers satisfy all the conditions.

Questions like

  • Greater than 240, less than 260, even: which number fits?
  • Greater than 315 and odd: which number fits?
  • Greater than 40, less than 50, even: how many numbers fit?

How the lesson starts: Number Constraint Challenges

  1. Detective Dot's case

    Hello, detective! Meet Detective Dot. She has a mystery number case. The secret number must fit every single clue. Grab your magnifying glass!

  2. Clues one and two

    Clue one: greater than 240. So the number comes after 240. Clue two: less than 260. So it comes before 260. The mystery number lives between them! 240 and 260 don't count.

  3. Test each suspect

    Clue three: the number is even. Test some suspects. 238 is even, but too small. 247 is between, but odd. 261 is too big. 252 is between and even. It fits every clue!