7th practice flashcard 11 (41-44)

Front

What is the formula for the area of a trapezoid?

Back

The area of a trapezoid is given by the formula: \( A = \frac{1}{2} (b_1 + b_2) h \), where \( b_1 \) and \( b_2 \) are the lengths of the two parallel sides and \( h \) is the height.

Front

Convert \( \frac{4}{5} \) to a decimal.

Back

\( \frac{4}{5} = 0.8 \)

Front

How do you round a number to the nearest ten thousand?

Back

To round to the nearest ten thousand, look at the thousands digit. If it is 5 or more, round up; if it is less than 5, round down.

Front

What is 80% of a number?

Back

To find 80% of a number, multiply the number by 0.8. For example, 80% of 60 is \( 60 \times 0.8 = 48 \).

Front

What is the result of \( 28 + (-10) \)?

Back

The result is \( 28 - 10 = 18 \).

Front

What is the definition of a trapezoid?

Back

A trapezoid is a four-sided figure (quadrilateral) with at least one pair of parallel sides.

Front

How do you calculate the area of a rectangle?

Back

The area of a rectangle is calculated by multiplying its length by its width: \( A = l \times w \).

Front

What is the decimal equivalent of 0.6?

Back

0.6 is equivalent to \( \frac{3}{5} \).

Front

What is the process of rounding numbers?

Back

Rounding numbers involves adjusting the digits of a number to make it simpler while keeping its value close to the original.

Front

What is the formula to find the percentage of a number?

Back

To find the percentage of a number, multiply the number by the percentage (in decimal form). For example, to find 20% of 50, calculate \( 50 \times 0.2 = 10 \).