Numbers > Numeracy

• Maths Everywhere URL

  Maths calculations and skills improvement. Requires Android 4.0 up. Free
  By Modern English

• Mathematics URL

  Calculate solutions for any formula. Requires Android 2.2 up. Free. 
  By Mathematics
  

• Photomaths URL

  Use phone camera to solve calculations. Requires Android 4.1. Free.
  By PhotoMath Inc
  

• Basic Arithmetic Practice URL

  Arithmetic practice, tests and flashcards. Requires Android 4.1 up. Free.
  By Varsity Tutors LLC 

• Learn Multiplication URL

  Long multiplication calculator. Requires Android 2.2 up and is £0.59.
  By MakeThisApp LLC
  

• Division Calculator URL

  Long division calculator with step by step display to aid learning. Requires Android 4.0 up. Free. 
  By  andrew.brusentsov

• Graphing calculator + Math URL

  Scientific, graphing, fraction, algebra, probability, matrix calculator. Requires Android 4.0. Free. 
  By Mathlab Apps, LLC
  

• Fraction Calculator URL

  Fraction and algebra calculator. Requires Android 4.0. Free.
  By Mathlab Apps, LLC

• Percentage Calculator URL

  Percentage calculator with various functions. Requires Android 3.0 up. Free. 
  By Newage Productions
  

• Triangle and Right Angle calc URL

  Trigonometry calculator. Requires 4.0 up. Free. 
  By Lunitsoft
  

• Protractor URL

  Protractor, uses camera viewer. Requires 3.0 up and is free.
  By Keuwlsoft 
  

• Ruler URL

  Ruler uses camera, units convertor, area calculator. Requires Android 4.0.3 up and is free.
  By NixGame 

• My Script Calculator Android URL

  My Script Calculator Free
  By My Script

• Exponent Calculator URL

  Convert powers to number. Requires Android 4.0 up. Free.
  By TTMA Apps

• iMathematics URL

  Arithmetic, algebra, geometry, trigonometric, fractions, graphic calculator. Requires iOS 8.0. Free
  By Moxibee
  

• Photo Math Camera Calculator URL

  Photo Math Camera Calculator. Requires iOS8.0. Free.
  By Photomath Inc

• Free Graphing Calculator URL

  A powerful graph calculator. Free Requires iOS 7.0
  By William Jockush

• Fraction Calculator + Decimals to Fractions URL

  Fraction calculator reduces and simplifies calculator as well as decimal to fraction and fraction to decimal. Free.Requires iOS 7.1
  By Visual Math Interactive Sdn. Bhd
  

• Long Division Calculator URL

  Long Division Calculator, helps learning long division. Free. Requires iOS 8.0
  By Regular Berry Software LLC

• Multiplication!!! URL

  App to learn and practice long multiplication.

• Percentage Calculator Free URL

  Percentage Calculator Free Requires iOS 9.0

  By Thomas Richardson

• Triangle Solver URL

  Triangle Solver  Free Requires iOS 9.0
  by William Jockusch

• Free Protractor URL

  Free Protractor Free Requires iOS 9.1
  by Pongo Soft

• Basic Arithmetic: Practice Tests and Flashcards URL

  Basic Arithmetic: Practice Tests and Flashcards Free Requires iOS 9.0
  By Varsity Tutors
  

• Ruler URL

  Ruler with measuring tape and photo measure tool Free Requires iOS 8.0
  By Tue Nguyen Minh

• Exponent Calculator URL

  Exponent Calculator £0.99 Requires iOS 7.0
  By jgytec
  

• My Script Apple URL

  My Script Free Requires iOS 7.0
  By My Script

• Mathspace URL

  Mathspace Android, Apple, Windows
  By Mathspace

• Calculator Read and Write Gold TexthelpFile

  Instructions and video displaying: Calculator in Read and Write Gold Texthelp

• General Maths Skills URL