3A. Turn it around

3A · Develop strategies
Turn it around
Shortcut 1 · Turn it around

The answer stays the same

A 4 by 6 array of circles turned to show the same 24 circles as a 6 by 4 array
4 × 6 = 24

Tap ⇄ to turn the factors around. The answer does not change.

If you know one, you know the other.

A useful shortcut

You have almost cut the job in half

Every fact below the diagonal has a matching fact above it.

Learn one triangle — use turning around for the other.
The square facts on the diagonal stay: 2×2, 3×3, 4×4…
You can stop here.
Repeat this strategy as often as you need before moving on.
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