← All Standards

Grade 2

• Geometry

  • 2.G.1
  • 2.G.3

• Measurement & Data

  • 2.MD.8
  • 2.MD.10

• Numbers & Operations: Base Ten

  • 2.NBT.2
  • 2.NBT.4
  • 2.NBT.5
  • 2.NBT.6
  • 2.NBT.7
  • 2.NBT.8
  • 2.NBT.9

• Operations & Algebraic Thinking

  • 2.OA.1
  • 2.OA.2
  • 2.OA.3

CCSS Math Standard: 2.OA.3

Determine whether a group of objects (up to 20) has an odd or even number of members, e.g., by pairing objects or counting them by 2s; write an equation to express an even number as a sum of two equal addends.

Crossing Every Bridge Exactly Once (aka Eulerian Paths)

How can you cross each bridge in this city exactly once?

Gr 2-4

Game: Number Scrabble

What if we played Tic-Tac-Toe with numbers and instead of three-in-a-row, we add up to 15? Well… then we’d have Number Scrabble!

Gr 1-6

Math Curiosity: Klauber’s Triangle

In 1932, a leading authority on rattlesnakes, Laurence Klauber, discovered a startling pattern within a triangle of primes.

Gr 2-8

Math Curiosity: Goldbach’s Conjecture

Can any even number be written as the sum of two primes? Goldbach thought so, but we haven’t proven it… yet!

Gr 1-5

Math Curiosity: Odds & Squares

Why does the sum of the first 5 odds also equal 5 squared?

Gr 1-4

Math Curiosity: Finding Primes

Prime numbers are unpredictable! How can we possibly find them all? An Ancient Greek mathematician found one way!

Gr 1, 2, 3, 4, 6

Math Curiosity: Collatz Conjecture

The Collatz Conjecture: start with any number and get to 1 using just two rules. It seems to always work…

Gr 1-5