Percents
What is a Percent?
Percents in short for percentages, means out of a hundred. A percentage is a number or ratio expressed as a fraction of 100. When writing a percentage, The sign “%” should always be used.
What is Decimal?
A decimal is a number that is less than 1. It starts off with a 0 leading to a decimal point, and then numbers that sum up to be less than 1.
What is Fraction?
Fractions are a part of a whole.
How to calculate Percent? (Fraction to Percent & Decimal to Percent)
Fraction to Percent: Divide numerator by denominator then times by 100. ( change fraction to a decimal, then multiply by hundred)
Decimal to Percent: Times by 100
Ex. 0.46 x 100 = 46%
How to calculate Decimal? (Percent to Decimal & Fraction to Decimal)
Percent to Decimal: Divide by 100.
Fraction to Decimal: Divide by 100 then remove "0." and place over 100.
How to calculate Fraction? (Percent to Fraction & Decimal to Fraction)
Percent to Fraction: Divide by 100, remove "0." and place over 100
Decimal to Fraction: Remove "0." and place over 100.
A test has 20 questions. If peter gets 80% correct, how many questions did peter miss?
80/100 × 20 = 0.80 × 20 = 16
Peter got 16 questions right
and, he got 4 wrong
Solve the following:
125.5 + 45.32 = 170.82
0.05 + 45.32= 45.37
Give an example calculate Fraction:
To alculate a fraction, you have to write it as a part out of a whole. ex 1/2
Change the following decimals to percents
1. 0.5
2. 0.00034
3. 5.2
4. 2.003
1. 50%
2. 0.034%
3. 520%
4. 200.3%
Change the following decimals to fractions:
1. 0.5
2. 0.34
3. 0.68
1. 1/2
2. 17/50
3. 17/25
Change each fraction to a percent:
1. 12/24
2. 34/48
3. 8/20
1. 50%
2. 71%
3. 40%
Fred had 8 out of 10 on a test. Janet had 82% on the test. Who did better? How do you know? Explain your work.
Janet did better because she got 82% while Fred got 80%.
A student subtracted 0.373 from 4.81 and got the difference 0.108.
a) What mistake did the student make?
b) What is the correct answer?
a) The student did not line up the digits of like value.
b) 4.437
A shop sells 100 ice creams in a day. The flavours of the ice creams are vanilla, chocolate, and strawberry. If 45 of the ice creams sold are vanilla and 1/4 are strawberry. What fraction is chocolate.
3/10