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Interact with our math tutor chatbot. Practice math by grade, topic and skill. Try our daily quiz below.

I can do calculations like 5+5, 2*(7+8), 3/9, sin(45), five times five, sqrt(16) or 2^10.

id: 1034

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Glossary

Count : To count means to find out the number of objects by adding one for every object.

Hint

Count up by 5 starting at 9.

Solution

The correct answer is A. Counting up from 9, we reach the right answer after 5 steps: 9, 10, 11, 12, 13, 14.

What is 9+5?

A 14
B 45
C 15
D 16

id: 5194

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Glossary

Area : The amount of unit squares that is needed to cover a 2-dimensional shape.

Inch : An inch or $in$ is a unit of measurement for length. 12 inches are one foot and 1 inch is about 2.54 $cm.$

Length : Length is the attribute of a one-dimensional shape that can be measured with a measuring tape.

Multiplication : Multiplication is the mathematical operation that is a shorthand for adding the same amount several times. For example $3\cdot 4=4+4+4=12.$

Rectangle : A rectangle is a quadrilateral with 4 right angles. Two opposing sides in a rectangle have the same length. They are sometimes referred to as the width and the length of the rectangle. To calculate the area of an rectangle one can multiply the width of the rectangle by the length of the rectangle. A square is the special case of a rectangle in which all side lengths are the same. Every rectangle is a parallelogram.

Reduced fraction : A reduced fraction (or simplified fraction or fraction in simplified form or fraction in simplest form) is a fraction $\frac{a}{b}$ such that $a$ and $b$ do not have any common factors bigger than 1. For example the reduced fraction of the fraction $\frac{4}{6}$ is $\frac{2}{3}.$

Square inch : Square inch is a unit of measurement for measuring area. 1 square inch is the area of a square with side length 1 inch. 144 square inches are 1 square foot.

Hint

Multiply width by length to get the area of the rectangle.

Solution

The correct answer is 2/5. The area of a rectangle is calculated by multiplying the width of the rectangle with the length of the rectangle and $\frac{5}{5}\cdot\frac{4}{10}=\frac{5\cdot 4}{5\cdot 10}=\frac{20}{50}=\frac{2}{5}.$

What is the area in square inches of a rectangle that is $\frac{5}{5}$ inches wide and $\frac{4}{10}$ inches long? Answer as a reduced fraction a/b.

id: 7529

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Glossary

Area : The amount of unit squares that is needed to cover a 2-dimensional shape.

Centimeter : A centimeter ($cm$) is $\frac{1}{100}$ of a meter.

Cube : A cube is a three-dimensional shape with 6 faces that are all squares. A cube has 8 corners and 12 edges.

Edge : An edge of a shape is a line segment between two corners of that shape.

Length : Length is the attribute of a one-dimensional shape that can be measured with a measuring tape.

Square centimeter : Square centimeter or $cm^2$ is a unit of measurement for measuring area. 1 square centimeter is the area of a square with side length 1 $cm,$ so 10,000 $cm^2$ are one $m^2.$

Surface area : The surface area of a three-dimensional shape is the area of the surface of the three-dimensional shape. For example the surface area of a cube with edge length 1 $cm$ is 6 $cm^2.$

Hint

The surface area is the area of all the sides combined.

Solution

The correct answer is 294. Each of the 6 sides of a cube have an area of 49 square cm for a total of $6\cdot 49=294$ square cm.

What is the surface area in $cm^2$ of a cube with edge length 7 cm?

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