LibrarySubtraction FluencyOne card

A LITTLE SOMETHING WORTH KNOWING

A small discovery. Yours to pass on.

Math & LogicOne small ahaDifference

17 − 15

Think it. Then flip it.
ahamoraTap to reveal
Back to the cue
Math & LogicOne small aha
Your new aha2

17 − 15 = 2. The difference tells you the gap between 15 and 17. Source: Subtraction

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 Subtraction Fluency

A few more worth knowing.

  1. 15717 − 14RECALL
    3

    Mental subtraction

    Open this card ↗
  2. 15817 − 13RECALL
    4

    Mental subtraction

    Open this card ↗
  3. 15917 − 12RECALL
    5

    Mental subtraction

    Open this card ↗