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Finding a Percent of a Number Two methods: 1.) Mental Math- (Only works for some percents) 2.) Multiplication method.

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Presentation on theme: "Finding a Percent of a Number Two methods: 1.) Mental Math- (Only works for some percents) 2.) Multiplication method."— Presentation transcript:

1 Finding a Percent of a Number Two methods: 1.) Mental Math- (Only works for some percents) 2.) Multiplication method

2 Mental Math Finding Percents 50% Write 50% as a fraction in lowest terms. Find 50% of 150. Find 50% of 240. To find 50% divide by 2. Trick:

3 Mental Math Finding Percents 25% Write 25% as a fraction in lowest terms. Find 25% of 32. Find 25% of 240. To find 25% divide by 4. Trick:

4 Mental Math Finding Percents 20% Write 20% as a fraction in lowest terms. Find 20% of 40. Find 20% of 350. To find 20% divide by 5. Trick:

5 Mental Math Finding Percents 10% Write 10% as a fraction in lowest terms. Find 10% of 50. Find 25% of 240. To find 10% divide by 10. Find 10% of 356. Trick:

6 Mental Math Finding Percents 5% Write 5% as a fraction in lowest terms. Find 5% of 80. Find 25% of 240. To find 5% divide by 20. Find 5% of 120. Trick:

7 Mental Math Finding Percents 1% Write 1% as a fraction in lowest terms. Find 1% of 70. Find 25% of 240. To find 1% divide by 100. Find 1% of 125. Trick:

8 Mental Math Finding Percents 33 % Write 33.3% as a fraction in lowest terms. Find of 51. Find 25% of 240. To find 33.3% divide by 3. Find of 126. Trick:

9 Percent Short cut 50% 25 % 20% 10% 5% 1%

10 How could we find 15%? Fin d 15% of 60.Find 15% of 42 How could we find 75%? Fin d 75% of 400.Find 75% of 60

11 Hint- "of " means multiplication Method two: Multiplying decimals Convert the percent to a decimal and multiply 1.) Find 45% of 40 2.) Find 35% of ) What is 12% of 43? 4.) Find 80% of 35

12 Demonstrate Understanding: Find each percent, you may use either method. 1.) 20% of 952.) 52% of 96 3.) 15% of 824.) of ) 26% of 266.) 30% of ) There were 40 questions on the test, if Samantha got 80% correct, how many questions did she get right?


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