Math 1

Learn Math part 1

100

review: 3567+3123+2445

9135

200

example: 67/90 

1. divide 67/90=0.74

2. multiply by 100 0.74x100=74

answer = 74%

37/80

1. divide 37/80=0.46

2. multiply by 100 0.46x100=46

answer is 46%

300

example: 70%

1. divide 70 by 100 70/100=0.70 or 0.7

2. place decimal number on top and place value on bottom 7/10, 70/100, answer can be 35/50

65%

1. divide 65 by 100 65/100=0.65

2. place decimal number on top and place value on bottom 65/100

answer is 65/100

400

example use equation y=mx+b m=2 b=5

1. substitute y=2x+5

m=5 b=3

y=5x+b

500

example: 2x+5=21

1. get rid of 5 by subtract 5 5-5=0 and subtract 5 from 21 21-5=16 2x=16

2. divide 16 by 2 has it shows on on 2x 16/2=8

x=8

2x+7=13

1. get rid of 7 by subtract 7-7=0 and subtract 7 from 13 13-7=6 2x=6

2. divide 6 by 2 to get rid of 2 in 2x 6/2=3

x=3

two-step equations

100

2x+3=15

x=6

200

2g-4=6

g=5

300

x/5+3=7

x=20

400

9x-5=16

x=3

500

-3x+(-2)=-17

x=5

percent

100

37/100

37%

200

9/10

90%

300

35/1000

3.5%

400

43/50

86%

500

76/50

152%

easy slope

100

m= 1 b=7

put it in slope form

y=1x+7

200

m=-5 b= 9 put in slope form

y=-5x+9

300

m=10 b=-6 put in slope form

y=10x-6

400

m=-12 b=-7 put in slope form

y=-12x-7

500

m=1/2 b=6 put in slope form

y=1/2x+6

fraction

100

55%

55/100

200

37%

37/100

300

99%

99/100

400

50% simply

1. put in fraction first 50/100

2. can equal to 4/8, 3/6, 2/4, 1/2 find the simplest form

answer=1/2

500

25%

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