Divisibility and Tally Marks

The video tutorial explains how to determine if 49 is divisible by 7. It begins by defining divisibility and then uses tally marks to represent the number 49. The instructor groups these tally marks into sets of seven to check if they can be evenly divided without any remainder. The process confirms that 49 can be divided into seven equal groups, demonstrating that 49 is divisible by 7.

What does it mean for a number to be divisible by another number?

• It can be divided only once.

• It can be divided into any number of groups.

• It can be divided with a remainder.

• It can be divided evenly without any remainder.

How many tally marks are used to represent the number 49?

• 21

• 14

• 49

• 7

Why is it important to ensure the tally marks count is correct?

• To make sure the groups are equal.

• To make sure the number is odd.

• To make sure the number is even.

• To make sure the number is prime.

Into how many groups is the number 49 divided?

• 5

• 6

• 8

• 7

What is the size of each group when 49 is divided evenly?

• 5

• 6

• 7

• 8

What conclusion can be drawn if there are no tally marks left over after dividing?

• The number is odd.

• The number is not divisible.

• The number is prime.

• The number is divisible.