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NO CALCULATORS!!!!!!! Integers are the whole numbers and their opposites (no decimal values!) Example: -3 is an integer Example: 4 is an integer Example: 7.3 is not an integer Adding integers comes down to two rules Rule 1: If the signs (+ or -) are the same, simply add the numbers and keep that value Example: -4 + -8 = -12 (because 4 + 8 is 12) Rule 2: If the signs are different, simply subtract the number closest to zero from the number further away from zero and keep the sign of the number furthest from zero Example: 3 + -7 = -4 (because 7 – 3 is 4) Subtraction and addition are friends, so subtraction just changes itself to addition by changing the second number’s sign. Make sure you follow the addition rules after that. Example: -4 – 6 means -4 + -6 = -10 They, too, are friends so they share the rules Rule 1: When the signs are the same (either + + or - -) simply do the operation and the answer will be positive Example: -25 ÷ -5 = 5 (since it is - -) Rule 2: When the signs are different (either + or - +) simply do the operation and the answer will be negative Example: -4 • 8 = -32 (since it is - +) -5 + 8 3 -11 – 4 -15 7 • -4 -28 -36 ÷ 9 -4 -3 + 2 -1 15 – (-2) 17 -8 • -3 24 12 ÷ -4 -3 -11 + -4 -15 -1 – (-6) 5 -11 • 2 -22 -28 ÷ -7 4