- Finding Percents and Percent Equations
- Home
- Finding a percentage of a whole number
- Finding a percentage of a whole number without a calculator: Basic
- Finding a percentage of a whole number without a calculator: Advanced
- Applying the percent equation: Problem type 1
- Applying the percent equation: Problem type 2
- Finding a percentage of a total amount: Real-world situations
- Finding a percentage of a total amount without a calculator: Sales tax, commission, discount
- Estimating a tip without a calculator
- Writing a ratio as a percentage without a calculator
- Finding the rate of a tax or commission
- Finding the total amount given the percentage of a partial amount
- Finding a percentage of a total amount in a circle graph

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# Finding a percentage of a whole number without a calculator: Basic

We can find the percentages of whole numbers without a calculator in some cases where standard percentages are involved. Some standard percentages are like 1%, 10%, 25%, 50%, 100%.

**Rules to find the percentage of a whole number without a calculator**

To find 1% of any whole number, we shift the decimal two places to the left in the whole number.

To find 10% of any whole number, we shift the decimal one place to the left in the whole number.

To find 25% of any whole number, we divide the whole number by 4.

To find 50% of any whole number, we divide the whole number by 2.

To find 100% of any whole number, we keep the whole number as it is.

What is 10% of 180?

### Solution

**Step 1:**

To find 10% of any whole number, we shift the decimal one place to the left in the whole number.

**Step 2:**

So, 10% of 180 is found by shifting the decimal point one place to left 180 = 180.0

So, 10% of 180 = 18.00 = 18

What is 25% of 70?

### Solution

**Step 1:**

To find 25% of any whole number, we divide the whole number by 4.

**Step 2:**

25% of 70 is found by divide the whole number by 4.

So, 25% of 70 = $\frac{70}{4} = 17.50$

What is 100% of 127?

### Solution

**Step 1:**

To find 100% of any whole number, we keep the whole number as it is.

**Step 2:**

So, 100% of 127 is found by keeping the whole number 127 as it is

So, 100% of 127 = 127