1. Mathe-magic Card Trick

2. Copy the following numbers onto five index cards. Write the numbers exactly as shown here:

3. Card 1 1357 9111315 17192123 25272931

4. Card 2 2367 10111415 18192223 26273031

5. Card 3 4567 12131415 20212223 28293031

6. Card 4 891011 12131415 24252627 28293031

7. Card 5 16171819 20212223 24252627 28293031

8. What to do: Ask your friend to secretly think of a number from 1-31. Give them the index cards and ask them to hand you each card that has their secret number on it. As you get each card, check out the number in the top left-hand corner. Add them all up, the sum will be the secret number. Reveal your guess. Ask your friend to secretly think of a number from 1-31. Give them the index cards and ask them to hand you each card that has their secret number on it. As you get each card, check out the number in the top left-hand corner. Add them all up, the sum will be the secret number. Reveal your guess.