Multiplication w/ estimation

Front

What is multiplication?

Back

Multiplication is a mathematical operation that represents the repeated addition of a number. For example, 3 multiplied by 4 (3 x 4) means adding 3 four times: 3 + 3 + 3 + 3 = 12.

Front

What is an estimate?

Back

An estimate is an approximate calculation or judgment of a value, often used when exact numbers are not necessary.

Front

How do you estimate a product by rounding?

Back

To estimate a product by rounding, round each number to the nearest ten, hundred, etc., and then multiply the rounded numbers.

Front

Back

24

Front

Back

100,000

Front

Back

240 (34 rounds to 30 and 7 rounds to 10, so 30 x 10 = 300, but the actual estimate is 240).

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Back

Overestimate.

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Back

25

Front

If Bill saves $4,902 a month for 6 months, how much does he save in total?

Back

About $30,000 (4,902 rounds to 5,000, so 5,000 x 6 = 30,000).

Front

What is the multiplication principle?

Back

The multiplication principle states that if one event can occur in 'm' ways and a second can occur independently in 'n' ways, then the two events can occur in 'm x n' ways.