Vocab
What measures how long something is?
Length
Convert millimeters to centimeters
divide by 10
Ping Ping has 200 cookies. 70% of them are chocolate. How many cookies are chocolate?
70/100 x 200 = 140.
140 cookies are chocolate.
10 out of 15 meters
10/15 = 2/3 x 100% = 200/3 = 66%
3000 mm --> cm
/10 = 300 cm
What measures how heavy something is?
Weight
convert centimeters to millimeters
multiply by 10
Pun has 300 bhat. He spends 120 bhat on a new game. What percent of his money did Pun spend?
120/300 x 100% = 40
Pun spent 40% of his money.
12 out of 36 students
12/36 = 1/3 x 100% = 100/3 = 33.3%
83 cm --> mm
x 10 = 830 mm
What do we call 100%?
One whole
convert centimeters to meters
divide by 100
Nice had 40.83 kg of rice. He divided it equally into 10 bags. How much rice was in each bag? Answer in grams.
40.83 / 10 = 4.083 kg.
4.083 kg x 1000 = 4083 g
Each bag has 4083 grams of rice.
100 baht out of 800 baht
100/800 = 1/8 x 100% = 100/8 = 12.5%
4.9 m --> cm
x 100 = 490 cm
What do we call 25%?
One quarter
convert meters to centimeters
Thorfan bent a piece of wire 6.8 meters long into a rectangle. The width of the rectangle is 70 cm long. What is the length of the rectangle? Answer in centimeters.
6.8 m x 100 = 680 cm
70 + 70 = 140
680 - 140 = 540
540 / 2 = 270
The length is 270 cm.
30 cookies out of 270 cookies
30/270 = 1/9 x 100% = 100/9 = 11.1%
1358 m --> km
/ 1000 = 1.358 km
What are the 3 steps to make a percent?
1) Make a fraction
2) Change denominator to 100
3) Change to percent!
convert meters to kilometers
divide by 1000
There are 36 classrooms and 12 have air conditioners. What percent of classrooms don't have air conditioners?
12/36 x 100 = 1/3 x 100 = 100/3
100/3 = 33.3%
100 - 33.3% = 66.7%
66.7% of classrooms don't have air conditioners.
Write the decimal and percent for the fraction 24/300
percent: 24/300 divided by 3 = 8/100 = 8%
decimal: .08
8.24 km --> m
x 1000 = 8240 m