Fun and games
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Fun and Games. Number Theory GONE WILD!. Factors “Fall” into Families. Multiples Multiply like Rabbits!. What am I Learning Today?. Divisibility Rules. How will I show that I learned it?. Create a graphic organizer that contains the divisibility rule, an example and an explanation.

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Fun and Games

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Fun and games

Fun and Games

Number Theory GONE WILD!

Factors “Fall” into Families

Multiples Multiply like Rabbits!


What am i learning today

What am I Learning Today?

Divisibility Rules

How will I show that I learned it?

Create a graphic organizer that contains the divisibility rule, an example and an explanation.

Use divisibility rules to determine the characteristics of numbers.


Turn to a partner and try to figure out what the yes numbers have in common

YES NO2 4364 11

128 31316 25

YES NO10 2465 33225 79610 246

Turn to a partner and try to figure out what the “yes” numbers have in common

Then, try to identify “What’s the rule?”


Fun and games

Checking Divisibility

Tell whether 462 is divisible by 2, 3, 4, and 5.

The last digit, 2, is even.

Divisible

The sum of the digits is 4 + 6 + 2 = 12. 12 is divisible by 3.

Divisible

Not divisible

The last two digits form the number 62. 62 is not divisible by 4.

Not divisible

The last digit is 2.

So 462 is divisible by 2 and 3.


Fun and games

Checking Divisibility

Tell whether 540 is divisible by 6, 9, and 10.

The number is divisible by both 2 and 3.

Divisible

The sum of the digits is 5 + 4 + 0 = 9. 9 is divisible by 9.

Divisible

The last digit is 0.

Divisible

So 540 is divisible by 6, 9, and 10.


Paired discussion

Paired Discussion

Turn to a partner and discuss the following:

How can the divisibility rules help you identify composite numbers?

If a number is divisible by 4 and 9, by what other numbers is it divisible? Explain.


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