Test Warm ups 2.1.10 1.Nick bought 8 pounds of tomatoes for $9.20 to make spaghetti sauce. Which of these rates gives the same price per pound? A.3 lbs.

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Presentation transcript:

Test Warm ups Nick bought 8 pounds of tomatoes for $9.20 to make spaghetti sauce. Which of these rates gives the same price per pound? A.3 lbs for $3.75 B. 2 lbs for $2.30 C. 7 lbs for $ Team 7-1 has 6 teachers and 128 students. Which of the following teams has the same ratio of teachers to students? A.Team 8-1 has 5 teachers and 106 students B.Team 6-2 has 7 teachers and 149 students C.Team Co-Teach has 3 main teachers and 64 students

Notes: In a proportion (comparing 2 rates or 2 ratios) CROSS PRODUCTS WILL ALWAYS BE EQUAL. IF THE CROSS PRODUCTS ARE NOT EQUAL, IT IS NOT A GOOD PROPORTION. COULD BE SOME DIFFERENT PROBLEMS: 1.YOU SET UP THE PROPORTION WRONG 2.YOU DID NOT CROSS MULTIPLY CORRECTLY 3.YOU FORGOT TO DIVIDE TO GET THE MISSING PIECE OF THE PROPORTION

How come this is NOT A GOOD PROPORTION??? 7 out of 11 students passed the test. How many passed out of 187 students?

Proportions On Denton’s soccer team, there are 3 coaches for every 52 players. How many coaches would be needed for 196 players? Hey! I think I’ll use one of those proportion thingies to solve this! WARM UPS

On Denton’s soccer team, there are 3 coaches for every 52 players. How many coaches would be needed for 196 players ? Correct Proportions:

These are incorrect proportions. Why??

coaches for players how many coaches for players? ?c?c 196p OK!! ?c?c 196p OK!!

PROPORTIONS OK NO!!!

WHAT WAS….AVERAGE SPEED? GET A UNIT RATE. (use a unit rate proportion) 500 MILES IN 4 HOURS. AVERAGE SPEED?