DEV Math Videos


Lesson 1 Lesson 11

Lesson 21

Lesson 2 Lesson 12  
Lesson 3 Lesson 13  
Lesson 4 Lesson 14  
Lesson 5 Lesson 15  
Lesson 6 Lesson 16  
Lesson 7 Lesson 17  
Lesson 8 Lesson 18  
Lesson 9 Lesson 19  
Lesson 10 Lesson 20  



Lesson 1  
  Lesson 1a whole numbers base ten decimal system of numbers place value
Lesson 1b whole numbers translating numbers in words to number symbols
Lesson 1c whole numbers rounding whole numbers
Lesson 1d math study tips
Lesson 2
  Lesson 2a whole numbers addition subtraction addends commutative property of addition associative property of addition additive identity property concept of borrowing
Lesson 2b whole numbers addition subtraction patterns
Lesson 2c math study tips
Lesson 3
  Lesson 3a whole numbers multiplication factors product zero factor commutative property associative property multiplicative identity patterns
Lesson 3b math study tips
Lesson 4
  Lesson 4a whole numbers division division terms divisor dividend quotient remainder special division patterns formula to check division
Lesson 4b whole numbers division large divisors
Lesson 4c whole numbers division word problems division patterns
Lesson 4d whole numbers division general guidelines for problem solving
Lesson 4e math study tips
Lesson 5
  Lesson 5a whole numbers factors exponent exponential notation
Lesson 5b whole numbers zero exponent expanding powers of ten
Lesson 5c whole numbers square root perfect square non-perfect square
Lesson 5d whole numbers calculator exponent key sqaure root key
Lesson 5e whole numbers parentheses rule rule for order of operations PEMDAS
Lesson 5f math study tips
Lesson 6
  Lesson 6a fractions numerator denominator
Lesson 6b fractions proper fraction improper fraction mixed number
Lesson 6c fractions equivalent fraction unit fraction
Lesson 6d fractions fraction form factoring prime number factorization greatest common divisor GCF GCD
Lesson 7
  Lesson 7a multiplication & division
Lesson 7b multiplication & division mixed numbers
Lesson 7c multiplication & division cancellation rules for multiplying fractions
Lesson 7d multiplication & division reciprocal multiplicative inverse
Lesson 7e multiplication & division dividing fractions
Lesson 7f multiplication & division dividing fractions rules for dividing fractions
Lesson 8
  Lesson 8a fractions lcd lowest common denominator adding fractions
Lesson 8b fractions mixed number fractions
Lesson 8c fractions subtracting fractions
Lesson 8d fractions subtracting fractions
Lesson 8e fractions comparing fractions compare
Lesson 9
  Lesson 9a fractions problem solving addition patterns word problems subtraction patterns
Lesson 9b fractions solving problems multiplication patterns word problems
Lesson 9c fractions problem solving division patterns word problems
Lesson 9d fractions problem solving strategies
Lesson 10
  Lesson 10a decimal decimals
Lesson 10b decimal decimals place values place value chart
Lesson 10c decimal decimals place values place value chart
Lesson 10d decimal decimals comparing size
Lesson 10e decimal decimals rounding
Lesson 11
  Lesson 11a decimal decimals adding subtracting addition subtraction
Lesson 11b decimal decimals multiplying multiplication
Lesson 12
  Lesson 12a decimal decimals dividing division dividing by powers of ten
Lesson 12b decimal decimals dividing division
Lesson 12c decimal decimals dividing division
Lesson 13
  Lesson 13a decimals addition patterns subtraction patterns
Lesson 13b decimals multiplication patterns
Lesson 13c decimals division patterns
Lesson 13d decimals word problems multiple steps
Lesson 14
  Lesson 14a ratios writing ratios writing ratios from words
Lesson 14b ratios complex ratios
Lesson 14c ratios complex ratios unit fraction
Lesson 14d rate unit rate complex ratios
Lesson 14e unit rates application of unit rates word problems
Lesson 15
  Lesson 15a property of proportions
Lesson 15b proportions solve a proportion
Lesson 15c solving proportions
Lesson 16
  Lesson 16a direct proportions propotional reasoning problems
Lesson 16b direct proportions propotional reasoning problems
Lesson 16c indirect proportions
Lesson 16d direct proportions indirect proportions problem solving
Lesson 17
  Lesson 17a decimal fraction percent conversion
Lesson 17b decimal fraction percent conversion
Lesson 17c decimal fraction percent conversion
Lesson 17d decimal fraction percent conversion
Lesson 17e decimal fraction percent conversion
Lesson 18
  Lesson 18a solving percent expressions base rule
Lesson 18b solving percent expressions proportional method
Lesson 18c solving percent expressions equation method

Lesson 19

  Lesson 19a percents percent applications
Lesson 19b percent formulas sales tax rate sales commission
Lesson 19c percent terms simple interest compound interest
Lesson 19d percent increase percent decrease
Lesson 20
  Lesson 20a measurements american units conversions length converting units dimensional analysis
Lesson 20b measurements american units conversions weight volume converting units dimensional analysis
Lesson 20c measurements american units conversions weight volume converting units dimensional analysis
Lesson 21
  Lesson 21a metric system metric abbreviations metric units
Lesson 21b metric to metric conversions horizontal chart method
Lesson 21c metric system weight volume horizontal chart
Lesson 21d metric system common references for length weight & volume