Topic 1 - Numbers Flashcards
1
Q
How do you divide fractions?
A
flip second fraction
multiple the two fractions
2
Q
how do you multiple fractions?
A
x across
3
Q
+ x + =
- x - =
- x + =
+ x - =
A
+
+
-
-
4
Q
how to turn a recurring decimal into a fraction?
A
1 no. recurring = x10 2 no. recurring = x100 3 no. recurring = x1000 e.g x = 0.22222 10x = 2.2222 10x - x 9x = 2 2/9
some recurring, some not:
a) get any numbers that are not recurring (before the first recurring number) before the decimal
b) get number recurring in front of decimal
b-a
e.g x = 0.25555 10x = 2.5555 100x = 25.555 100x(b) - 10x(a) 90x = 25 25/ 90 = 5/18
5
Q
what is direct and inverse proportion?
A
direct = one goes up, other goes up by constant amount inverse = one goes up, other goes down (double one, halve the other)
6
Q
how to do direct proportion?
A
(to find either x or y)
y § x (squared)
y = kx(squared)
7
Q
how to do inverse proportion?
A
y § 1/x
y § k/x
8
Q
what is:
≺
≻
A
= greater than
= less than
