Balancing Scales

 We wondered how heavy these popcorn kernels were.

Which is heavier, these popcorn kernels or a glass marble?

 We poured the kernels onto one side of the scales.

                                        

 Look what happened.

 We guessed how many glass marbles we would have to use to balance the scales.

 We put all of our guesses into counting order.

 Kobi kept a tally while we added marbles one at a time.

Yay! Finally the two sides matched. 

When they weighed the same, the scales balanced.

Guess how many glass marbles we used?

Hint...