LibraryMultiplication FluencyOne card

A LITTLE SOMETHING WORTH KNOWING

A small discovery. Yours to pass on.

Math & LogicOne small ahaProduct

9 × 20

Think it. Then flip it.
ahamoraTap to reveal
Back to the cue
Math & LogicOne small aha
Your new aha180

9 groups of 20 make 180. Reversing the factors, 20 × 9, gives the same product. Source: Multiplication table

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 Multiplication Fluency

A few more worth knowing.

  1. 15310 × 2RECALL
    20

    Mental multiplication

    Open this card ↗
  2. 15410 × 3RECALL
    30

    Mental multiplication

    Open this card ↗
  3. 15510 × 4RECALL
    40

    Mental multiplication

    Open this card ↗