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Middle Balance illustrates equation solving Why are fractions so difficult? Negative or zero exponents Number to zero power is one - 2 proofs How to teach proportions Hands-on with pi Sine in seniors web a right triangle Rational numbers & converting repeating decimals into fractions Why study math? square roots? algebra? Square roots without a calculator? High School Why seniors web high school geometry is difficult Help with high school geometry Fascinating irrational numbers Proof that square root of 2 is irrational Rational seniors web numbers are countable How does calculator find values of sine? Fibonacci numbers and golden section What is proof? Two-column proof vs. paragraph proof Proving is a process - logarithm problem Why does the square root algorithm work? Place Value Ideas Teaching tens and ones Tens and ones practice Counting in groups of ten Skip-counting (0-100) Comparing (0-100) Cents and dimes Place Value - hundreds Comparing (0-1000) Place value - thousands Comparing thousands Rounding Place value - big numbers Add/Subtract lessons Missing addend concept (0-10) Addition facts with 6 Addition & subtraction connection Within 0-100 Add/subtract whole tens (0-100) Easy principle of adding ones Fact families for basic facts Sum over next whole ten Add 2-digit numbers mentally Subtract 2-digit numbers mentally Carrying to tens
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