Topic(s): counting and cardinality

## Purpose

To identify one more or one less than a given number.

This activity can be done several different ways. You might show children a number with your fingers and ask them to say the number is* one more* than the number you are showing. Then ask children to say the number that is *one less* than the number you are showing. You might also reverse the activity by saying a number and asking children to show you one more and/or one less on their fingers. Finally, you might conduct the entire activity orally: say a number and ask children to tell you the number that is one more or one less than the number you said.

In Part 1, show a number (up to 9) using fingers and have children to say the number is* one more* or *one less* than the number you are showing. In Part 2, you say a number (up to 9) and ask the children to show you *one more* or *one less* using fingers. The extension moves to conducting the activity entirely orally.

(Hold up some fingers). What number is *one more*? What number is *one less*?

- Hold up 5 fingers.
- Hold up 3 fingers.
- Hold up 8 fingers.
- Hold up 6 fingers
- Hold up 7 fingers.
- Continue play with other fingers up to 9.

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

(Say a number aloud). What number is *one more*? Show using your fingers. What number is *one less*? Show using your fingers.

- 5
- 8
- 1
- 4
- 9
- Continue play other numbers up to 9.

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

I’m going to say a number aloud. What number is *one more*? What number is *one less*? (You may choose to stick with numbers 0 to 10 or include numbers to 20 as well).

Prompts:

- 6 (one more… 7)
- 5 (one less… 4)
- 8 (one more… 9)
- 3 (one less… 2)
- 10 (one less… 9)
- 4 (one more… 5)
- 7 (one more… 8)

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