Estimating Percent-Shelf Elf

Front

What is a percent?

Back

A percent is a way of expressing a number as a fraction of 100. It is denoted by the symbol '%'.

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How do you calculate a percentage of a number?

Back

To calculate a percentage of a number, multiply the number by the percentage (in decimal form). For example, to find 20% of 50, calculate 50 x 0.20 = 10.

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What does it mean to estimate?

Back

To estimate means to make an approximate calculation or judgment about a value or quantity.

Front

What is rounding in mathematics?

Back

Rounding is the process of adjusting a number to make it simpler and easier to work with, usually to the nearest whole number or specified decimal place.

Front

What is the formula for finding a discount?

Back

Discount = Original Price x Discount Rate.

Front

If an item costs $90 and has a 20% discount, what is the discount amount?

Back

The discount amount is $18 (calculated as $90 x 0.20).

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What is the difference between an exact value and an estimate?

Back

An exact value is a precise number, while an estimate is an approximate value that is close to the exact number.

Front

How do you round the number 89 to the nearest ten?

Back

89 rounded to the nearest ten is 90.

Front

What is the best way to estimate 23% of $90?

Back

The best way to estimate 23% of $90 is to round it to 20% of $90, which is $18.

Front

What is a discount rate?

Back

A discount rate is the percentage by which the original price of an item is reduced.