WHAT IS A RATIO A RATIO COMPARES TWO

USE DEDUCTIVE REASONING TO WRITE RATIOS THERE ARE 105 STUDENTS ON TEAM 1. 50

USE DEDUCTIVE REASONING TO WRITE RATIOS THERE ARE RED AND GREEN APPLES IN A

YOU HAVE SEEN THE COMMERCIALS ON TELEVISION THAT GO SOMETHING LIKE THIS: FOUR OUT

9 out of 10 dentists recommend sugarless gum to patients. DO 9 ____ 810

9 out of 10 dentists recommend sugarless gum to patients. DO 9 ____ 72

9 out of 10 dentists recommend sugarless gum to patients. DO 9 ____ :

9 out of 10 dentists recommend sugarless gum to patients. DO 9 ____ 225

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WHAT IS A RATIO? • A RATIO COMPARES TWO NUMBERS IN A SPECIFIC ORDER. • A RATIO CAN BE WRITTEN IN THREE FORMS: NNNNNNN PPPP THE RATIO OF N 7: 4 -or- 7 TO 4 TO P IS -or- 7/4.

USE DEDUCTIVE REASONING TO WRITE RATIOS THERE ARE 105 STUDENTS ON TEAM 1. 50 STUDENTS ARE GIRLS. THE RATIO OF GIRLS TO TOTAL IS 50 TO 105 THE RATIO OF BOYS TO TOTAL IS 55 : 105 THE RATIO OF BOYS TO GIRLS IS 55/50

USE DEDUCTIVE REASONING TO WRITE RATIOS THERE ARE RED AND GREEN APPLES IN A BOWL. 13 APPLES ARE RED; 7 ARE GREEN. THE RATIO OF REDS TO TOTAL IS 13 : 20 THE RATIO OF TOTAL APPLES TO 20 TO 7 GREEN APPLES IS THE RATIO OF RED TO GREEN APPLES IS 13/7

YOU HAVE SEEN THE COMMERCIALS ON TELEVISION THAT GO SOMETHING LIKE THIS: FOUR OUT OF FIVE DENTISTS RECOMMEND SUGARLESS GUM TO THEIR PATIENTS WHO CHEW GUM. HOW DO YOU INTERPRET THE PHRASE “OUT OF” ? www. tridentgum. com

A survey showed that 4 out of 5 people preferred Brand A to Brand B. A A : B A B : Total 4 1 5 ____ : _____ 10 50 10 IS THE MULTIPLIER a) If 50 people were interviewed, how many preferred Brand B? _____

A survey showed that 4 out of 5 people preferred Brand A to Brand B. A A : B A B : Total 4 1 5 ____ : _____ 32 8 8 IS THE MULTIPLIER a) If 8 people preferred Brand B, how many preferred Brand A? _____

9 out of 10 dentists recommend sugarless gum to patients. DO 9 ____ 810 : : DON’T 1 _____ : TOTAL 10 : _____ 90 IS THE 900 MULTIPLIER a) If 900 dentists were surveyed, how many recommended sugarless gum? _____

9 out of 10 dentists recommend sugarless gum to patients. DO 9 ____ 72 : : DON’T 1 _____ : TOTAL 10 : _____ 8 IS THE 80 MULTIPLIER b) If 72 dentists recommended sugarless gum, how many were surveyed? _____

9 out of 10 dentists recommend sugarless gum to patients. DO 9 ____ : : DON’T 1 _____ 12 : TOTAL 10 : _____ 12 IS THE 120 MULTIPLIER c) If 120 dentists were surveyed, how many did NOT recommend sugarless gum? _____

9 out of 10 dentists recommend sugarless gum to patients. DO 9 ____ 225 : : DON’T 1 _____ 25 : TOTAL 10 : _____ 25 IS THE MULTIPLIER d) If 25 dentists DID NOT recommend sugarless gum, how many dentists DID recommend it? _____