Definitions
The bottom number in a fraction
(1/2)^-1
2
(1/2)/(1/2)
1
18/90
1/5
There are 200 students in a primary school. 80 students wear glasses. What fraction of the students wear glasses? Give the fraction in its simplest form.
2/5
A repeated addition.
Multiplication.
5^-1
1/5
(2/3)/(1/4)
8/3
25/16
Irreducible
Juan has eaten 2/5 of a pie and María has eaten 4/7 of the other one. Who has eaten more?
María
Symbols used in pairs to group things together.
Brackets or parentheses
(2/3)^-2
9/4
1/(2/5)
5/2
51/17
3
Sarah has $240 and she gives her mum $80. What fraction of the money does Sarah have left? Give the fraction in its simplest form.
2/3
In a power, it indicates the number of times a number is multiplied by itself.
Exponent
(-1/3)^-3
-27
(1+1/3)/(5/3)
4/5
252/420
3/5
Chris eats 1/4 of a cheesecake and later eats 2/5 of the cheesecake. What fraction remains?
7/20
The process of putting a number up or down to the nearest whole number or the nearest hundred, thousand, etc.
Rounding
(3/9)^-4
81
(2/3-1/2)/(1/2-2/3)
-1
315/495
7/11
A butcher sells 2/3 of his hamburger patties2 on Monday and 1/2 of the remainder on Tuesday. What fraction of the patties remains unsold?
1/6