Mathematics
Grade 10
15 min
Complete the mixed-number multiplication sentence
Complete the mixed-number multiplication sentence
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1
Introduction & Learning Objectives
Learning Objectives
Formulate a mixed-number multiplication sentence to find a missing dimension of a 3D figure.
Solve for an unknown variable in a geometric formula (volume, surface area) involving mixed-number multiplication.
Accurately convert mixed numbers to improper fractions as a primary step in solving multiplication and division problems.
Apply the concept of reciprocals to isolate a variable in a multiplication sentence involving fractions.
Calculate the volume and surface area of prisms and cubes with mixed-number dimensions.
Interpret a word problem involving 3D figures and translate it into a solvable multiplication equation.
Verify the solution to a geometric problem by substituting the found value back into the original multiplication sentence.
An architect...
2
Key Concepts & Vocabulary
TermDefinitionExample
Mixed NumberA number composed of a whole number and a proper fraction. It represents a value greater than one.3 1/2, which means three whole units and one half of another unit.
Improper FractionA fraction where the numerator (top number) is greater than or equal to the denominator (bottom number). Converting mixed numbers to improper fractions is essential for multiplication.The mixed number 3 1/2 is equivalent to the improper fraction 7/2.
Multiplication SentenceAn equation that shows factors being multiplied to get a product. In this context, we will solve for a missing factor.For a prism, Length × Width × ? = Volume. For instance, 5 1/4 * 3 * h = 63.
Volume of a Rectangular PrismThe measure of the three-dimensional space enclosed by the prism, calculated by multip...
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Core Formulas
Mixed Number to Improper Fraction Conversion
a \frac{b}{c} = \frac{(a \times c) + b}{c}
To multiply or divide mixed numbers, you must first convert them into improper fractions. Multiply the whole number by the denominator, add the numerator, and place the result over the original denominator.
Volume of a Rectangular Prism Formula
V = l \times w \times h
Use this formula to relate the volume (V) of a rectangular prism to its length (l), width (w), and height (h). If any one of these values is unknown, it can be found by isolating it in the equation.
Surface Area of a Cube Formula
SA = 6s^2
Use this formula to find the total surface area (SA) of a cube given its side length (s). This can be part of a larger multiplication sentence, for example, to find the number of c...
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Easy
To correctly multiply mixed numbers like 3 1/4 and 2 1/2, what is the essential first step according to the core rules?
A.Multiply the whole numbers (3 × 2) and then multiply the fractions (1/4 × 1/2).
B.Convert both mixed numbers into improper fractions.
C.Find a common denominator for the fractional parts.
D.Add the whole numbers and multiply the fractions.
Easy
A rectangular prism has a length of 2 1/2 meters and a width of 4 meters. The multiplication sentence to find its volume is 2 1/2 × 4 × h = V. What is the product of the known dimensions, length and width?
A.8 1/2 square meters
B.8 square meters
C.10 square meters
D.6 1/2 square meters
Easy
What is the reciprocal of the mixed number 5 2/3?
A.3/17
B.17/3
C.5 3/2
D.3/5
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