With this mental math trick you will beable to add and subtract in your head rapidly – a critical skill in everyday math. In this video we look at tips on how to do basic addition and subtraction instantly without using a calculator. Fast math is good math!
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It is easy to avoid borrowing when you are subtracting if you minus by pairs of digits rather than individually. Use this method to do lightening fast subtraction calculations with no problem! In this fast and ea...
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