How Many Are Hiding?
Count on 1 and Count Back 1
Materials:
20 Counters
Cup or plate
Recording sheet and pencil for each person
Student questions posted on board for all students to use
Directions:
1. Students work with a partner and get supplies listed above
2. Students dump out all or some of the 20 counters and announces how many there are. (Ex. We have the
number 15)
3. Player 1 grabs one of the counters they dumped out and hides the rest under the plate (or cup). The other
one counter is placed on top of the plate (or cup).
4. Students follow the progression of the questions listed below.
Player 1: What number do you see?
Player 2: I see the number _____________.
Player 1: How many are hiding?
Player 2: _____ are hiding.
Player 1: How do you know _________ are hiding?
Player 2: I know ____ are hiding because_______________.
5. Students switch roles
6. Students use recording sheet to record results.
This activity gives the opportunity for students to:
Compose and decompose numbers in a variety of ways and discover how to use this information when adding and
subtracting.
If students has no response when asked how many are hiding or the student makes an unreasonable correct
answer to the number hiding: The number is too big and the child cannot visualize how many are hiding. Try
using the next smaller amount of counters. SFMP 4 and SFMP 7
If the response is close but not correct or the student thinks long about what’s hiding and figures out the correct
answer by counting each object: The child is showing some understanding of the parts of the number but needs
more practice with that number of counters. SFMP 4 and SFMP 7
If the student responds quickly and accurately: The parts of the whole have been internalizes and student is ready
to work on the next larger amount of counters. SFMP 4 and SFMP 7
Idea from: http://www.insidemathematics.org
How Many Are Hiding
Game 1
Number in all _______
Hiding
Out
Idea from: http://www.insidemathematics.org
How Many Are Hiding
Game 2
Number in all _______
Hiding
Out