LibraryAddition FluencyOne card

A LITTLE SOMETHING WORTH KNOWING

A small discovery. Yours to pass on.

Math & LogicOne small ahaSum

5 + 13

Think it. Then flip it.
ahamoraTap to reveal
Back to the cue
Math & LogicOne small aha
Your new aha18

5 + 13 = 18. Changing the order gives 13 + 5, 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. 905 + 14RECALL
    19

    Mental addition

    Open this card ↗
  2. 916 + 6RECALL
    12

    Mental addition

    Open this card ↗
  3. 926 + 7RECALL
    13

    Mental addition

    Open this card ↗