Do Now
1. Bill correctly answers 22 questions on his math test. There
are 25 questions on the test. What is the percent of the
questions that Bill answers correctly?
2. Find the missing number.
27% of ____________ is 54
3. What is 20% of $30.00?
Do Now Solution
1. Bill correctly answers 22 questions on his math test. There
are 25 questions on the test. What is the percent of the
questions that Bill answers correctly?
22 𝑥 4 88
=
25 𝑥 4 100
= 88%
Do Now Solution
2. Find the missing number.
27% of ____________ is 54
27 𝑥 2
54
=
100 𝑥 2 200
=
27% of 200 is 54
27 𝑥 2 = 54
Do Now Solution
3. What is 20% of $30.00?
a.
20  10
2
=
100  10 10
b. 20 = .20
100
30
𝑥.20
00
60
6.00
2𝑥3
10 𝑥 3
=
6
100
= 6%
Introduction to Division
• You will each need a divisbility rules booklet.
• Put your name period and student number on the
back page that is blank.
• As we go over the rules you will fill in the rules in your
booklet and include a sample number.
Introduction to Division
• Today we are going to look at some rules for division.
• These are like short cuts to help us determine if a
multi-digit number is divisible by another a single digit
number without having to do the whole problem.
Introduction to Division
Lets practice what we just learned
Question 1
Question 2
Question 3
Use “divisibility rules” to determine which of the following
numbers 2016 is divisible by
A 9
B 4
C 7
D 5
Question 3
Use “divisibility rules” to determine which of the following
numbers 2016 is divisible by
A 3
B 4
C 10
D 5
Test for divisibility for 4
2016 is divisible by 4 because the
last two digits are divisible by 4.
16 ÷ 4 = 4
Test for divisibility for 5
2016 is not divisible by 5 because the
last digit is no 0 or 5.
Test for divisibility for 3
2016 is not divisible by 3 because the
sum of the digits is 9 and nine is
divisible by 3. 2016 is also divisible by 9
Now it is your turn
• Each person at your table will need to come up with a four digit
number.
• Once everyone has a number the person sitting at desk 3 will
share their number. The group will work together to determine
if any of the divisibility rules apply. You can’t use any numbers
that have already been used.
• When you find a divisibility rule that applies write the number
down along with the number and the rule.
• Example: 8991 is divisible by 9 because 8+9+9+1=27 and 27 is
divisible by 9