Transcript Document

Bellwork: Week 1, Day 1
1) 20 is what percent of 80?
2) Solve for x.
-3 + 2x = 13
3) 54 - 92 =
4) Joseph beat Aaron in 4 out of 7 video games they
played. What percentage of games did Joseph win?
5) (-5)(27) =
Answer Key
1) 20 is what percent of 80? 25%
2) Solve for x. x = 5
-3 + 2x = 13
3) 54 - 92 = -38
4) Joseph beat Aaron in 4 out of 7 video games they
played. What percentage of games did Joseph win?
57%
5) (-5)(27) = -135
th
8
Grade Math
Identifying,
Comparing, and
Ordering Rational and
Irrational Numbers
Warm-Up Activity
Today we will warm up by
working with equivalent
fractions.
A recipe calls for:
3
2
5
4
2
cups of flour
cups of bananas
3
2
1
3
cups of sugar
We are going to double and half the recipe.
2
3 •2
5
3
2
5
2
Ingredients
3
2
5
cups of
flour
4
5
9
1
3
1
cups of
3
sugar
2
6
2
cups of
3
bananas
4
Double
recipe
4
2
3
cups
cups
cups
Half of
recipe
7
1
10
2
1
3
1
1
6
cups
cups
cups
Whole-Class Skills Lesson
Today, you are going to identify
numbers as rational or irrational
numbers and order them from least
to greatest.
rational numbers
A number that can be expressed as a ratio of
two integers, in other words, a fraction.
irrational numbers
A number that cannot be expressed as a ratio
of two integers.
Venn Diagram
Give examples of rational numbers.
.25
4
5
5
Give examples of irrational numbers.
π
√2
repeating decimals
1
= 0.33
3
terminating decimals
4
5
= 0.8
Repeating and terminating
decimals are rational numbers.
Number Decimal Rational Irrational
43
8
π
–37
5
5.375
X
Do you think pi is rational or irrational?
Number Decimal Rational Irrational
π
Why do you think so?
Pi is irrational.
Number Decimal Rational Irrational
π
X
If you try to write it as a decimal, you will
never find an end, and it will never repeat.
Do you think this number is rational or
irrational?
Number Decimal Rational Irrational
–37
5
Why do you think so?
–37
5
is rational.
Number Decimal Rational Irrational
–37
5
–7.4
X
The quotient of the number is a
terminating decimal.
Create a Poster
Must explain integers, irrational, rational, whole
and numbers.
Ideas:
• Write a song, rap or poem
• Create a work of art
• Make an informative poster with definitions
• Write a cartoon or funny story
• Come up with your own idea