One Less

Say the number that is one less (1 to 10).

Warm-up, learn, try it together, practice, then a quick check. About 15 minutes.

What children learn in Level 12

Here are 5 birds. One bird flies away. Now there are 4. One less than 5 is 4.
One less is the number you say just before. Count back one step: one less than 7 is 6.
Your turn! There were 9 bees, and one flew away. Tap to count the bees that are left.
One less than 1 is 0. If there is 1 cookie and you eat it, there are 0 cookies left.
Try it with a grown-up! Stack some blocks. Take one away. How many now? Keep going until there are none!

Georgia's K-12 Mathematics Standards:

K.NR.1.3 — Given a number from 1-20, identify the number that is one more or one less.