Math Flashcards
roman numeral (RM) L=
50
(RM) C=
100
(RM) D=
500
(RM) M=
1000
(+)+(-)=
sign of the larger number
(-)+(-)=
NEGATIVE #
(-)x(-)=
POSITIVE #
(-)x(+)=
NEGATIVE #
(-) divided by (-)=
POSITIVE #
(-) divided by (+)=
NEGATIVE #
-10x47=
-470
-65+-32
-97
-7x4=
-28
what is the greatest common factor (GCF)?
a set of numbers is the largest number that can evenly divide into all of the numbers in the set
what is the GCF of 24 and 18?
factors of 24:1 ,2,3,4,6,8,12,24
factors of 18: 1,2,3,6,9,18
The GCF is 6
what is the GCF of 20 and 16?
the GCF is 4
1yd=
3ft
1gal=
16cups
12in=
1ft
1meter =
1000mm
1kg=
1000g
1L=
1000ml
1cm=
10mm
dividing a decimal by a decimal
5.76 divided by 0.3=
19.2
dividing a decimal by a decimal
86.4 divided by 0.12=
720
dividing a decimal by a decimal
23.6 divided by 0.04=
590
dividing a decimal by a whole number
4.85 divided by 5=
0.97
dividing a decimal by a whole number
95.1 divided by 6=
15.85
simplify the fraction 121/77
they both share a common factor of 11. so id we didide each number by 11 you can simplify the fraction.
11/7
simplify the fraction 3/12
1/4
simplify the fraction 14/49
2/7
improper fractions into mixed numbers
17/3
5 2/3
improper fractions into mixed numbers
36/6
6
improper fractions into mixed numbers
51/9
5 6/9
multiplying fractions
6 x 1/3
2
multiplying fractions
12x 3/5
7 1/5
multiplying fractions
3/4 x 2/3
1/2
multiplying fractions
1/7 x 2/3
2/21
whats an important thing to remember when your dividing fractions?
KEEP, SWITCH, FLIP
keep the first fractions, switch the dividing to multiply, then flip the second fractions
dividing fractions (keep,switch, flip) 1/2 divided by 2/5
1 1/4
dividing fractions
2/8 divided by 1/4
1
dividing fraction by mixed number
1/4 divided by 2 2/5
5/48
dividing fraction by mixed number
5/8 divided by 6 2/3
3/32
dividing fraction by mixed number
2/5 divided by 1 1/5
1/3
multiplying mixed numbers by fractions
3 1/4 x 2/5
1 3/10
multiplying mixed numbers by fractions
5 2/3 x 3/7
2 3/7
multiplying mixed numbers by fractions
1/4 x 8 1/2
17/8
adding fractions
3/8 + 2/12
13/24
adding fractions
2/3 + 1/6
5/6
adding fractions
1/6 + 5/9
13/18
subtracting fractions
10/12 - 5/8
5/24
subtracting fractions
2/3 - 1/5
7/15
subtracting fractions
2 1/3 - 3/2
5/6
converting fractions into decimals
9/25
.36
converting fractions into decimals
3/16
.1875
converting decimals into fractions
.45
9/20
what is the equation used for proportions?
a/b= c/d
what do you do with proportions?
cross multiply
percentages
part/whole =
percent
percentages
whole x percent =
part
percentages
part/percent=
whole
percent change
amount of change/original amount=
percent change
percent change
original amount x percent change =
amount of change
percent change
amount of change/ percent change =
original amount
probabilities
desired outcomes/ total possible outcomes =
probability
probabilities
probability x total possible outcomes =
desired outcomes
probabilities
desired outcomes/ probability =
total possible outcomes
what are the KEY words for ADDITION?
added, combined, increased by, in all, total, perimeter, sum, & more than
what are the KEY words for SUBTRACTION?
how much more, less than, fewer than, fewer than, exceeds, difference, & decreased
what are the KEY words for MUTIPLICATION?
of, times, area, & product
what are the KEY words for DIVISION?
distribute, share, average, per, out of, percent, & quotient
what are the KEY words for EQUALS?
is, was, are, amounts to, & were
distant word porblems
d=
rt
work problems
rate x time =
work
how do you find the MEAN?
total all the terms together then divide by the number of terms
find the mean of 24, 27, and 18
69 divided by 3 = 45
what is the MEDIAN?
the middle number in a given set
how do you find the MEDIAN?
put the number in numerical order & the middle number will bee the median
what is the median of 24, 27, 18?
18, 24, 27
its 24
what do you do if their are two MEDIANS?
you add them together then you divide by 2
what is the median of 24, 27, 18, 19?
18, 19, 24, 27
19+24 divided by 2 will be 21.5
what is the MODE?
the number which occurs most frequently within a given set
what is the mode of 2, 5 , 4, 4, 3, 2, 8, 9, 2, 7, 2, 2
2
what is the AREA formula for CIRCLE?
A = π r2
what is the PERIMETER formula for CIRCLE?
C=2 πr = πd
what is the AREA formula for TRIANGLE?
A=b x h divided by 2
what is the PERIMETER formula for TRIANGLE?
p= s1 + s2 + s3
what is the AREA formula for SQUARE?
A=s2
what is the PERIMETER formula for SQUARE?
p=4s
what is the AREA formula for RECTANGLE?
A= l x w
what is the PERIMETER formula for RECTANGLE?
p=2l + 2w
what is the pythagorean theorem formula?
a2 + b2=c2
