Slime

• What is an equation?

  A mathematical sentence stating two expressions are equal
• What does the equals sign (=) indicate?

  That the amount is the same on both sides
• How is an equation similar to a balance scale?

  Everything must be equal on both sides
• What defines a true equation?

  When the amounts are equal on both sides
• What defines a false equation?

  When the amounts are unequal on both sides
• What is an open equation?

  When an amount is unknown on one side
• What happens when you find a number for n in an open equation?

  You change it to a true equation
• How can you classify the equation 11 - 3 = 5?

  It is a false equation
• How can you classify the equation N + 4 = 7?

  It is an open equation
• What is an inverse operation?

  The opposite operation used to undo the first
• How do you solve an addition equation?

  Use subtraction as the inverse operation
• How do you solve a subtraction equation?

  Use addition as the inverse operation
• What is the solution for n in the equation n + 4 = 7?

  n = 3
• What is the solution for n in the equation n - 5 = 4?

  n = 9
• What is the solution for n in the equation n + 4 = 17?

  n = 13
• What is the solution for n in the equation n - 6 = 13?

  n = 19
• What is the solution for n in the equation n + 7 = 15?

  n = 8
• What is the solution for n in the equation n - 8 = 17?

  n = 25
• What does the Commutative Property state?

  Order of addition does not change the sum
• How can you use the Commutative Property in the equation n + 7 = 7 + 4?

  n = 4
• How can you use the Commutative Property in the equation m + 2 = 2 + 5?

  m = 5
• How can you use the Commutative Property in the equation z + 3 = 3 + 9?

  z = 9
• How can you use the Commutative Property in the equation g + 6 = 6 + 11?

  g = 11
• How can you use the Commutative Property in the equation s + 4 = 4 + 20?

  s = 20
• How can you use the Commutative Property in the equation c + 8 = 8 + 32?

  c = 32
• What is the Identity Property of Addition?

  Adding zero does not change the value
• What is the solution for n in the equation n + 0 = 8?

  n = 8
• What is the solution for b in the equation b + 0 = 7?

  b = 7
• What is the solution for m in the equation m + 0 = 3?

  m = 3
• What is the solution for v in the equation v + 0 = 5?

  v = 5
• What is the solution for w in the equation w + 0 = 4?

  w = 4
• What is the solution for r in the equation r + 0 = 2?

  r = 2
• What are the subtraction rules of zero?

  n - n = 0 and 4 - 0 = 4
• What is the value of n in the equation n - 8 = 0?

  n = 8
• What is the value of n in the equation n - 9 = 0?

  n = 9
• What is the value of n in the equation n - 0 = 7?

  n = 7
• What is the value of n in the equation n - 0 = 9?

  n = 9
• What is the value of n in the equation n - 7 = 0?

  n = 7
• What is the value of n in the equation n - 0 = 5?

  n = 5
• How do you write equations for word problems using variables?

  • Identify the unknown variable
  • Translate the problem into a mathematical sentence
  • Example equations:
  • Timothy: 72 + n = 99
  • Jasmin: 15 + 30 = n
  • Issak: 4 x 25 = n