Activity 1:
Find the percentage. Write your answer
In your notebook.
1) 15% of 80 is
2) What is 50% of 707
Find the base. Write your answer in
your notebook.
1) 50 is 8% of what number?
2) 20% of what number is 15
Find the rate. Write your answer in your
notebook.
1) 10 is what percent of 20?
2) 5 is what percent of 25?
Find the percentage. Write your answer
In your notebook.
1) 15% of 80 is
2) What is 50% of 707
Find the base. Write your answer in
your notebook.
1) 50 is 8% of what number?
2) 20% of what number is 15
Find the rate. Write your answer in your
notebook.
1) 10 is what percent of 20?
2) 5 is what percent of 25?
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Answers & Comments
P = Percentage
B = base
R = rate
To find the percentage we will use multiply. R × B
1. 15% × 80 = n
The 15, turn it into decimal form.
0.15 × 80 = 12
So the percentage of rate (15) and base (80) is 12
2. 50% of 707
50% × 707 = n
0.50 × 707 = 353.5 or 354
The percentage of rate and base is 354
Find the base.
To find the base of p and R, we need to it like this.
R = 8%, P = 50, B =?
3. 8% of n = 50
0.8 × n = 50
0.8n/0.8 = 50/0.8
N = 63
4. 20% of n = 15
0.20 × n = 15
0.20n/0.20 = 15/0.20
N = 75
Find the rate
To find the rate, (rate is that have sign %) we use times (×)
5. n/100 × 10 = 45
10n/100 = 45
10n = 45 × 100
10n = 4500
10n/10 = 4500/45
N = 100
The rate of base and percentage is 100
6. N/100 × 5 = 25
5n/100 = 25
5n = 25 × 100
5n = 2500
5n/5 = 2500/5
N = 500
The rate of base and percentage is 500
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