About kids do maths
When you study about numbers, they include these Operations: Addition, subtraction. You must remember ways to do arithmetic if there's addends forming in a positive or negative. You will have the sum of 2 addends or of inverse, the difference of 2 minuennd and subtrahend with note of change-marker, which called complement in machine calculation.
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kids do maths version 1.0 on your
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Android package:
com.maths4child, download kids do maths.apk