2.2 Introducing Subtraction of Integers Chip Model Practice 9 – -3 = ? 9 – -3 = 12 -9 – 3 = ? -9 – 3 = -12 -9 – -3 = ? -9 – -3 = -6.

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Presentation transcript:

2.2 Introducing Subtraction of Integers Chip Model Practice 9 – -3 = ? 9 – -3 = – 3 = ? -9 – 3 = – -3 = ? -9 – -3 = -6

2.2 Introducing Subtraction of Integers ALGORITHM Example 1Example 2Example 3 9 – (-3) = ?-9 – 3 = ?-9 – (-3) = ?  Keep the sign of the first number  Change the subtraction sign to addition 9 + (-3) = ? = ?-9 + (-3) = ?  Change the sign of the second number  Apply the addition rules 9 + (+3) = (-3) = (+3) =

‘Subtraction’ Flap of Foldable Left side Keep, Change, Change Keep the sign of the first number Change the subtraction sign to addition Change the sign of the second number Apply the ‘Addition Rules’ Right side Ex. 9 – (-3) Keep 9 + (-3) Change Change = 12 Ex. -6 – (-8) Keep -6 + (-8) Change Change = 2

Keep, Change, Change Keep the sign of the first number. Change the subtraction sign to addition Change the sign of the second number Apply the ‘Addition Rules’

Examples Ex. 9 – (-3) Keep 9 + (-3) Change Change = 12 Ex. -6 – (-8) Keep -6 + (-8) Change Change = 2

Keep, Change, Change Keep the sign of the first number. Change the subtraction sign to addition Change the sign of the second number Apply the ‘Addition Rules’

Examples Ex. 9 – (-3) Keep 9 + (-3) Change Change = 12 Ex. -6 – (-8) Keep -6 + (-8) Change Change = 2

Keep, Change, Change Keep the sign of the first number. Change the subtraction sign to addition Change the sign of the second number Apply the ‘Addition Rules’

Examples Ex. 9 – (-3) Keep 9 + (-3) Change Change = 12 Ex. -6 – (-8) Keep -6 + (-8) Change Change = 2