#Double #Twice as…as / compared to, three times as…as / compared to #Two-fold / three-fold

DOUBLE (adj)

 His income is double hers.
 Our profit was double in the following year.
 The number of students in school B was double that in school A in 2000
 The period between 2005 and 2009 witnessed a double increase in the number of jobless people from 600 to 1200.
 There was a double increase in the number of jobless people from 600 to 1200 between 2005 and 2009.

Double (v)

 The number of unemployed people doubled between 2005 and 2009.
 We doubled our profits in the following year.
 The number of people without job doubled between 2005 and 2009.

TWICE AS…AS / COMPARED TO, THREE TIMES AS…AS / COMPARED TO

many/much
 There were twice as many people without job in 2009 as in 2005.
 Twice as many people were jobless in 2009 compared to 2005.
 Twice as much rice was exported in 2009 compared to 2005.
 She did twice as much work as her brother.
 The number of students in school B was twice as high as that in school A in 2000
 The number of students in school B was three times as high as that in school A in 1998

TWO-FOLD / THREE-FOLD

Two-fold, three-fold  (adj)
 There was a twofold increase in the number of people without job between 2005 and 2009.
 There was a three-fold increase in the number of students in school A from 1998 to 2000


Two-fold, three-fold  (adv)
 The number of people without job increased twofold between 2005 and 2009.
 The number of students in school A increased three-fold from 1998 to 2000

Souce: @MRS.TRANG IELTS