1. Percent of a Number
2.7 p. 147

2. 15 30
We created equivalent ratios. By doubling the 100 to 200, we just had to double the first terms in each of the ratios. 30 17 34 34 15 30 30 18 36 36 12 24 24

3. Snack
Ratio/100
? / 200
Fruit 23
Cheese 15
Veggies 17
Cookies
Chips 18
No snack 22
Total
100
200 46 30 34 36 44
( x 2)
In this ratio tables, instead of using the % sign, you see the total of 100 is used.

4. = 𝑥

5. 𝑝𝑎𝑟𝑡 𝑤ℎ𝑜𝑙𝑒 =

6. Let’s talk about the values represented on this bar.
10% of 300?? 30
Half of this???? 15
15% = 10% + 5%

7. 18% of 300 = .18(300)
= 54
(3) (3) =
Which number represented the part?
Which number represented the whole?

8. Percents greater than 100 or less than 1
145% of % of % of 58
1.45(320) =
2.20(65) =
.0025 (58) =
.145
464
143
Which number represented the part?
Which number represented the whole?

9. Which number represented the part?
Which number represented the whole?
145%= ?
100% of 320 would be 320.
More than 100% of a number will be greater than the number.
29 2 (10) 𝑥 32 (10) 1
29(16) 1
145% 𝑜𝑓 320= =464

10. 11 5
= = 11 5 13 1
11 5 65
Which number represented the part?
Which number represented the whole?
143
143

11. x 600 = n
1.28 x 550 = n
.003 x 200 = n
= 5.1
= 704
= .6
Which numbers represented the parts?
Which numbers represented the whole?

12. Which numbers represented the parts?
The decimal multiplication method is the best for these values.
1.28 x 550 = n
x 600 = n
.003 x 200 = n
= 5.1
= 704
= .6
Which numbers represented the parts?
Which numbers represented the whole?

13. 20%, or 1/5 of the 70 players competed in soccer. What is 1/5 of 70?

14. What is 15% of 20? .15 x 20 = ?? = 3 students
Which number represented the part?
Which number represented the whole?

15. .32 x 60 = x 220 = x 4 =
19.2
1.21 11
32(60) 100
Can anyone think of this in a
different way?
32(6) 10 = =
Which number represented the part?
Which number represented the whole?

16. There are several ways, but they one you will use most often is:
Write the percent as a decimal
Multiply the decimal (part) by the other number (whole) to find the missing part.