WHAT ARE INTEGERS LETS DEFINE INTEGERS A set

WHAT ARE INTEGERS?

LETS DEFINE INTEGERS A set of whole numbers and opposites

OPERATION ON INTEGERS ADDING POSITIVE AND NEGATIVE INTEGERS

OPERATION ON INTEGERS Rules for Addition If signs are the same, ADD and keep the sign. If signs are different, SUBTRACT and keep the sign of the larger value.

Examples OPERATION ON INTEGERS No. 1 No. 3 5 + 10 = 15 9 + (-3) = 6 2 + 11 = 13 4 + (-8) = – 4 No. 2 No. 4 -4 + (-8) = – 12 -20 + 2 = – 18 -2 + (-1)= – 3 -6 + 15 = 9

OPERATION ON INTEGERS SUBTRACTING POSITIVE AND NEGATIVE INTEGERS

OPERATION ON INTEGERS 3 STEPS TO SUBTRACT INTEGERS 1. Change subtraction sign into addition sign 2. Change the sign of the subtrahend 3. Use Addition rules.

Examples OPERATION ON INTEGERS 5 – 10 = Rule No. 1 5 + 10 = Rule No. 2 5 + (– 10) = Rule No. 3 5 + (– 10) = – 5 5 – (– 10) = Rule No. 1 5 + (– 10) = Rule No. 2 5 + (+10) = Rule No. 3 5 + 10 = 15

OPERATION ON INTEGERS MULTIPLYING POSITIVE AND NEGATIVE INTEGERS Rules for Multiplication Positive x Positive x Negative x Positive Negative x Negative Positive

Examples OPERATION ON INTEGERS No. 3 No. 1 – 7 x 3 = – 21 5 x 10 = 25 No. 4 No. 2 5 x (– 10) = – 25 – 6 x – 2 = 12

OPERATION ON INTEGERS DIVIDING POSITIVE AND NEGATIVE INTEGERS Rules for Division Positive ÷ Positive ÷ Negative ÷ Positive Negative ÷ Negative Positive

Examples OPERATION ON INTEGERS No. 1 20 ÷ 5 = 4 No. 2 16 ÷ (– 2)= – 8 No. 3 – 10 ÷ 2 = – 5 No. 4 – 6 ÷ (– 2) = 3