All questions on Maths

percentages

I'm struggling with how I work out 21% of 52. I was never any good at percentages.

Emma

Answers

52 x 21/100 = 10.92

jon.ellis

14 April 2010

52 x 21/100 = 10.92

jon.ellis

14 April 2010

Break it down..First, divide by 10 to get value of 10%So 52 divided by 10 equals 5.2 (the numbers shift to the right by one place in terms of place value).Then work out 1%..So 5.2 divided by 10 equals 0.52Then multiply your answer for 10% by 2 to get 20%5.2 times by 2 equals 10.Then, add your answer for 20% to your answer for 1%So 10.4 plus 0.52 equals 10.92This is the way I would teach it so that you understand what is going on - especially if you did not have a calculator. The other method below is great to put straight into your calc - as long as you know which numbers to put in!

Steve R.

05 February 2014

daum_equation_1391561496088.png

Steve R.

05 February 2014

daum_equation_1391561478545.txt

Steve R.

05 February 2014

Hi KevinTo work out a percentage of a number. You divide what you have by 100 and then multiply it by the percentage you need. So for this example we have 52 divided by 100 and then multiplied by 21The answer will be 10.92

chrisc1992

05 February 2014

Hey to solve your problem you can do the following methods:21% of 52Method 10.21*52 = 10.92Method 210% of 52 = 5.210% of 52 = 5.21% of 52 = 0.52Therefore adding these together gives = 21% of 52 = 10.92Method 3(21/100)*52 = 10.92Hope that helps!

armankarim

07 February 2014

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How to Find 1 Percent of a Number

Introduction

Have you ever seen a 5% discount in a shop or needed to calculate a 15% tip? All percentage calculations, no matter how complex, are built on one simple, core skill: finding 1 percent.

The word "percent" literally means "per hundred." So, 1% is simply one part out of one hundred.

Once you know how to find 1% of a number, you can easily find any other percentage.

To find 5%, you just find 1% and multiply it by 5.
To find 20%, you find 1% and multiply it by 20.
To find 72%, you find 1% and multiply it by 72.

This guide will show you the one simple trick to find 1% of any number instantly.

The Key Method: Finding 1%

Because 1% means "one out of one hundred" (£1/100£), finding 1% of a number is the same as dividing that number by 100.

The fastest way to divide any number by 100 is to move the decimal point two places to the left.

That's the entire trick.

Worked Example 1: A simple number

Find 1% of 300.

The number is 300. The decimal point is at the end: 300.
Move the decimal two places to the left: 3.00
Answer: 1% of 300 is 3.

Worked Example 2: A number with no zeros

Find 1% of 189.

The number is 189. The decimal point is at the end: 189.
Move the decimal two places to the left: 1.89
Answer: 1% of 189 is 1.89.

Worked Example 3: A number that already has a decimal

Find 1% of 84.5.

The number is 84.5.
Move the decimal two places to the left: 0.845
Answer: 1% of 84.5 is 0.845.

Worked Example 4: A very small decimal number

Find 1% of 0.7.

The number is 0.7.
Move the decimal two places to the left. We need to add zeros for the empty spaces: 0.007
Answer: 1% of 0.7 is 0.007.

Practice Questions & Solutions

Score:

Find 1% of 500.

Solution

To find 1% of 500, we move the decimal point two places to the left.

500. becomes 5.00

Answer: 5

Find 1% of 900.

Solution

To find 1% of 900, we move the decimal point two places to the left.

900. becomes 9.00

Answer: 9

Find 1% of 250.

Solution

o find 1% of 250, we move the decimal point two places to the left.

250. becomes 2.50

Answer: 2.5

Find 1% of 476.

Solution

To find 1% of 476, we move the decimal point two places to the left.

476. becomes 4.76

Answer: 4.76

Find 1% of 81.

Solution

To find 1% of 81, we move the decimal point two places to the left.

81. becomes 0.81

Answer: 0.81

A t-shirt costs £40. How much is 1% of its price?

Solution

To find 1% of £40, we move the decimal point two places to the left.

40. becomes 0.40

Answer: £0.40 (or 40p)

Find 1% of 15,200.

Solution

To find 1% of 15,200, we move the decimal point two places to the left.

15200. becomes 152.00

Answer: 152

Find 1% of 70.5.

Solution

To find 1% of 70.5, we move the decimal point two places to the left.

70.5 becomes 0.705

Answer: 0.705

Find 1% of 1.25.

Solution

To find 1% of 1.25, we move the decimal point two places to the left.

1.25 becomes 0.0125

Answer: 0.0125

A bank offers a 1% annual interest rate. If you deposit £5.50, how much interest would you earn in a year?

Solution

We need to find 1% of 5.50. We move the decimal point two places to the left.

5.50 becomes 0.0550

Answer: £0.055

Gianpiero Placidi