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HOW TO REMEMBER FORMULA AND CALCULATOR?
Try INVBAT.COM
INVenting Brain Assistant Tools
INFORMATION
INVBAT.COM is making easy to remember formulas and equations that we need as we progress towards digital industrial age (also called as the 4th Industrial Revolution).
INVBAT.COM plus your smartphone, tablet, laptop, and desktop computer will help you to solve similar problem in less than one minute. That is our promise , try it.
VOICE DATA ENTRY
valid only for smartphone with microphone icon.
Touch clear button. Next touch any white button. Next touch microphone icon 
. Next speak numbers only.
For decimal use the word "point" example say, "thirteen point seventy five" . Then touch the Solve button.