Page 36 - PlayFacto_S4

Let’s solve problems by using 50 board and number chips.

Materials: 50 Board, 1 Number chip set (1-50)

1 Prepare one 50 board and number chips from 1 to 50.

2 Place the board face up without showing the numbers and place all the
number chips in order on the board.

3 Flip all the chips that are multiples of 1 and flip back all the chips that
are multiples of 2.

Example

Multiple of 1 Multiple of 2

4 Repeat the steps to flip the chips that are multiples of 3, 4, 5, …, 50.

Example

Multiple of 2 Multiple of 3

5 When flipping all the chips at the steps 3 - 4 , write all the numbers that

are faced down. Talk about the answer in the previous page and the fact

you found in this page. If the closed

lockers are to be

opened, how many

times do I have to

repeat opening and

closing them?

Even or odd number

of times?

3. Factors 33