Library›Multiplication Fluency›One card

A LITTLE SOMETHING WORTH KNOWING

A small discovery. Yours to pass on.

Math & LogicOne small ahaProduct

4 × 5

Think it. Then flip it. ahamoraTap to reveal Back to the cue
Math & LogicOne small aha
Your new aha20

4 groups of 5 make 20. Reversing the factors, 5 × 4, 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. 434 × 6RECALL
    24

    Mental multiplication

    Open this card ↗
  2. 444 × 7RECALL
    28

    Mental multiplication

    Open this card ↗
  3. 454 × 8RECALL
    32

    Mental multiplication

    Open this card ↗