Integer Rules Adding with the same sign Rules

Integer Rules

Adding with the same sign • Rules • • Add like normal Keep the sign • Examples -12 + -10 = -22 (all signs are negative) 12 + 10 = 22 (all signs are positive

Adding with different signs • Rules • Subtract the difference of the absolute value (av) • Keep the sign of the highest absolute value (av) • Examples -10 + 8 10 – 8 (subtract av) -2 (keep sign of highest av)

Subtraction with different signs • Rule Add the opposite • Example 12 - (-12) = 12 + 12 = 24 (add the opposite of -12) 12 – (12) 12 + (-12) = 0 (add the opposite of 12)

Multiplication & division (even number of “-” signs) • Rule • If you multiply or divide integers that have an even number of negative signs – then positive • Examples -5 x -7 = 35 (even number of negative signs - 2) -2 x -3 x -2 x -1 = 12 (even number of negative signs – 4) -3 x 2 x -1 x 2 = 12 (even number of negative signs – 2) -20 / -5 = 4 (even number of signs – 2)

Multiplication & division (odd number of “-” signs) • Rule If you multiply or divide an integers that have an odd number of negative sings – then negative • Examples -3 x 5 = -15 (odd number of negative signs – 1) -3 x 4 x -2 x -1 = -24 (odd number of negative signs – 3) 12 / -3 = -4 (odd number of signs - 1)

Additional practice • Integers Jeopardy – go to the following link http: //www. math-play. com/Integers-Jeopardy/Integers. Jeopardy. html