Grade: 1, Topic(s): counting and cardinality

## Purpose

To count forwards and backwards from 0 to 20.

For the teacher: classroom clock or stopwatch

Count from zero to twenty in unison with your class. If you can, use a clock or stopwatch to say one number per second. A good way to do this is to say, “one second, two seconds, three seconds, …” This will help children develop a sense of time. Then count backward from ten down to zero, again pacing your counting with seconds if possible.

Part 1 begins with counting forwards from 0 to 10 and then backwards from 10 to 0. Part 2 moves to counting forwards from 0 to 20 and then backwards from 20 to 0. The extension progresses to practicing fluent forwards and backwards counting

As a group, let’s count forwards starting at 0 and ending at 10 and then backwards from 10 to 0, trying to say one number for each second.

- Zero seconds, one second, two seconds, three seconds… nineteen seconds, twenty seconds (and then backwards to 0).

*While children are enjoying their building of mastery, feel free to repeat. When children are eager for more, try Part 2.*

As a group, let’s count forwards starting at 0 and ending at 20 and then backwards from 20 to 0, trying to say one number for each second.

- Zero seconds, one second, two seconds, three seconds… nineteen seconds, twenty seconds (and backwards to 0).

** ***As always, when children seem excited for a new challenge, move on.*

Let’s count forwards starting at 0 and ending at 50 and then backwards from 50 to 0.

- 0, 1, 2, 3…48, 49, 50 (and then backwards to 0).

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