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15 Minute Math
15 Minute Math
Decimals Integers
Decimals Integers
o Lesson 1 – What Are Decimals? o Lesson 12 – Addition & Subtraction
Lesson 1 – What Are Decimals? Lesson 12 – Addition & Subtraction
o Lesson 2 – Addition & o Lesson 13 – Multiplication,
Lesson 2 – Addition & Lesson 13 – Multiplication,
Subtraction Division, & Absolute Value
Subtraction Division, & Absolute Value
o Lesson 3 – Multiplication Algebra
Lesson 3 – Multiplication Algebra
o Lesson 4 – Division o Lesson 14 – Adding & Subtracting
Lesson 4 – Division Lesson 14 – Adding & Subtracting
Variables
Fractions Variables
Fractions
o o Lesson 15 – Multiplying & Dividing
Lesson 5 – What Are Fractions? Lesson 15 – Multiplying & Dividing
Lesson 5 – What Are Fractions?
Variables
o Lesson 6 - Addition & Variables
Lesson 6 - Addition &
o Lesson 16 – Square Roots
Subtraction (no whole #s) Lesson 16 – Square Roots
Subtraction (no whole #s)
o Order of Operations
Lesson 7 – Addition & Order of Operations
Lesson 7 – Addition &
Subtraction (with whole #s) o Lesson 17 – Please Excuse My
Subtraction (with whole #s) Lesson 17 – Please Excuse My
o Dear Aunt Sally
Lesson 8 – Multiplication & Dear Aunt Sally
Lesson 8 – Multiplication &
Division o Lesson 18 – Order of Operations
Division Lesson 18 – Order of Operations
with Variables
Percentages with Variables
Percentages
o Practice Tests
Lesson 9 – Converting Decimals Practice Tests
Lesson 9 – Converting Decimals
to Fractions to Percents o Lesson 19 – Practice Test #1
to Fractions to Percents Lesson 19 – Practice Test #1
o Lesson 10 – Calculating the Part o Lesson 20 – Practice Test #2
Lesson 10 – Calculating the Part Lesson 20 – Practice Test #2
o Lesson 11 – Cross-Multiplication
Lesson 11 – Cross-Multiplication
Method
Method
15 Minute Math – Decimals
15 Minute Math – Decimals
Lesson # 1 – What Are Decimals?
Lesson # 1 –
This lesson explains how to
This lesson explains how to
read and work with decimals.
read and work with decimals.
Problem: You work in a medical lab and you need to tell your
Problem: You work in a medical lab and you need to tell your
coworker how much medicine you need.
coworker how much medicine you need.
“I need two tenths of a gram of insulin.”
“I need two tenths of a gram of insulin.”
Saying numbers correctly can ensure everyone is talking about the
Saying numbers correctly can ensure everyone is talking about the
same thing.
same thing.
15 Minute Math – Decimals
15 Minute Math – Decimals
Lesson # 1 – What Are Decimals?
Lesson # 1 –
Decimals are numbers that are less than 1 but greater than
Decimals are numbers that are less than 1 but greater than
0
0
0 < 0.1 < 1 (0.1 is between 0 and 1, so it is a decimal)
0 < 0.1 < 1 (0.1 is between 0 and 1, so it is a decimal)
They appear to the right of the decimal point
They appear to the right of the decimal point
whole number decimal
whole number decimal
39.1
39.1
“39” is the whole number part
“39” is the whole number part
“.1” is the decimal part
“.1” is the decimal part
“39.1” is read… “0.1” is the same
“39.1” is read… thing as “.1”. “.1” is just
“Thirty-nine and one tenth”
“Thirty-nine and one tenth” a lazy way of writing the
number.
15 Minute Math – Decimals
15 Minute Math – Decimals
Lesson # 1 – What Are Decimals?
Lesson # 1 –
s
h
s t
d s d
n s h n
a s s h t a
s d d t d s
u n e ed n u
o a r s s r a o
h s d s h d s h
-t u n n e t n u -t
n o u e n en u o n
e h h t o t h h e
t t t t
1 2 3 4 5 6 7 8 9
10,000. The “3” is in the hundreds column,
+ 2,000. so there are “3 hundreds”. Remember,
+ 300. If all the other numbers were decimals have a
+ 40. a 0, then the number would be “th” at the end of
+ 5. their names.
00300.0000, which is 300 (three hundred.)
+ .6
+ .07 The “7” is in the hundredths column,
+ .008 so there are “7 hundredths.”
+ . If every other number were a 0, then the number
0009 would be 00000.0700, which is 0.07 (seven hundredths.)
12,345.6789
”
d
an
“
15 Minute Math – Decimals
15 Minute Math – Decimals
ay
s
,
Lesson # 1 – What Are Decimals? t
Lesson # 1 – in
t o e
r p r
a al e
p h
r m w
e i t
b c r e
e a m
To read a number… m d p
To read a number… u e l a
a n
n h s
e t m n i
l e ci m r
ho e e u e
s d ol b
w
u e c m
e o h e u
h y t n
t h
e d t t
ad er a y as
e a l
e h R S
R W ) ) e
) h
) 3 4 t
1
2
For example: 20.045 is read, “Twenty and forty-five
For example: 20.045 is read, “Twenty and forty-five
thousandths.”
thousandths.”
t h t
e u h
n n o
t d u Extra zeroes to the far right of
h r s
s e an a decimal don’t change the
d d
t value, but they do change how
h t
s h
s you pronounce the number.
0.2 = 0.20 = 0.200 but…
0.2 = 0.20 = 0.200 but…
0.2 = “two tenths”
0.2 = “two tenths”
0.20 = “twenty hundredths”
0.20 = “twenty hundredths”
0.200 = “two hundred
0.200 = “two hundred
thousandths“
thousandths“
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