When this clever “COUNTING” card is turned over, students notice one spot on the first side and 4 spots on the other side, then they see 3 spots on the first side, and even 6 spots on the other side. It’s magic! and it’s COOL MATH, but it takes some practice…
The magician (you) need to accurately place your fingers over precise spots or empty places on the card, so that the audience (students) will think it has 4 sides!
You need a white poster board piece 2-3/4 x 4/-1/2 inches to use as a card, AND … some large, self-adhesive colored paper dots
Put 2 dots on one side of the card (as shown) and 5 dots on the reverse side, then practice these movements of the card and fingers.
1. Show the 2-dot side with your fingers covering one dot, so they see just 1 on the first side.
2. Flip over the card to show the 5-dot side, being careful to cover the middle dot, so they see just 4 on that side.
3. Turn the card from front to back AND reverse it top to bottom so they see the 2 dots with your finger covering the white space below, which makes them think it’s 3 dots
4. Finally turn the card from front to back and reverse it top to bottom, so they see the 5 dots with your finger covering the empty space where a 6th dot would be, so they count 6 on that side!
See EXAMPLE VIDEO of how it works: