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Resources
 Math for Kindergarten and Grade 1, such as A + B, A - B 
 Math for Grade 2, 3, 4, such as A * B - C, A + B * C, with option of decimal
  Math for Grade 2, 3, division
 Math for Grade 3, 4, such as (A + B) * C, A * ( B - C)
 Math for Grade 4, 5, such as (A + B) * (A - B) = A*A - B*B,  A*C +B*C = (A + B ) *C, A*C - B*C = (A-B) * C
 Math for Grade 3,4,5, fraction addition/subtraction with option of decimal
  Math for Grade 4,5, decimal addition/subtraction, multiplication
 Math for Grade 4, 5, 1-variable Algebra,
  More 1-variable Algebra 
 Math for Grade 5, 6, 2-variable Algebra
 Math for Grade 4,5, division with remaining
 Math for Grade 4,5, Calculate GCD & LCM with option of algebra variables
  Math for Grade 3,4,5, pattern, added a(2)=a(1)+a(0)
  Math for Grade 3,4,5, fraction sorting
 Math for Grade 5, 6, negative numbers, absolute values, exponents
  Math for Grade 5, 6, absolute value equation
  Math for Grade 5, 6, inequality algebra
  Math for Grade 5, 6, equation factoring
  
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