+ - adio / addition, - - tynnu / subtraction, x - lluosi / multiplication, ÷ - rhannu / division, % - canrannau / percentages, = - hafal / equals, > - mwy na / greater than, < - llai na / less than, mm - milimedrau / milllimetres, cm - centimedrau / centimetres, km - cilomedrau / kilometres, m - medr / metre, g - gramau / grams, kg - cilogram / kilogramme, ml - mililitr / millilitres, l - litr / litres, t - tunnelli / tonne, ½ - ffracsiwn / fraction, 0.5 - degolyn / decimal, °c - gradd selsiws / degree celsius, n - newtonau / newtons, ° - gradd / degree,

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