Library›Addition Fluency›One card

A LITTLE SOMETHING WORTH KNOWING

A small discovery. Yours to pass on.

Math & LogicOne small ahaSum

18 + 19

Think it. Then flip it. ahamoraTap to reveal Back to the cue
Math & LogicOne small aha
Your new aha37

18 + 19 = 37. Changing the order gives 19 + 18, the same sum. Source: Addition ↗

ahamoraReference ↗

Keep the thread going

One answer is a beginning.

Share a little curiosity, or follow it into the full collection.

Flip the full deck →

More from Addition Fluency

A few more worth knowing.

  1. 37218 + 20RECALL
    38

    Mental addition

    Open this card ↗
  2. 37318 + 21RECALL
    39

    Mental addition

    Open this card ↗
  3. 37419 + 19RECALL
    38

    Mental addition

    Open this card ↗