1. Estimating with Percents Chapter 5.4 B

2. Percent-Fractions you should memorize! 20% = 1/550% = 1/280% = 4/525% - 1/433% = 1/3 30% = 3/1060% = 3/590% = 9/1075% = 3/466% = 2/3 40% = 2/570% = 7/10100% = 1

3. Percent-Fractions you should memorize! 10% = 1/1020% = 1/525% = 1/430% = 3/1033% = 1/3 40% = 2/550% = 1/260% = 3/566% = 2/370% = 7/10 75% = 3/480% = 4/590% = 9/10100% = 1

4. How can you find 20% of 58? Since we know 20% is also 1/5, we need to come up with a number that is close to 58 and divides by 5. 1515 of 60 60 ÷ 5 = 12 So 20% of 58 is ABOUT 12

5. How can you find 76% of 22? This time we need to change 76% to 75% because the fraction 3/4 is easier. THEN change 22 to something that divides by 4! 3434 of 20 20 ÷ 4 = 5 Since the top number is 3 we have to multiply by that (it’s like mentally finding 3/5!!! So 5 x 3 = 15, which means 76% of 22 is ABOUT 15

6. We use this in the real world ALLLLLLLLLLLLLLLL the time!!! 78% of the Mako team scored a level 3 or higher on the FCAT. There are 181 kids on the team. ABOUT how many kids scored 3 or higher? 4545 of 180 180 ÷ 5 = 36 Since the top number is 4 we have to multiply by that! So 36 x 4 = 144, which means 78% of 181 is ABOUT 144 students

7. Find 55% of 42 Some percents are in between 2 others (like 55%) so you may have to do 2 problems! 1212 of 40 40 ÷ 2 = 20 Since 55 is between these 2 find the number that is also between the 2 answers! 3535 of 40 40 ÷ 5 = 8 8 x 3 = 24