Mathematics Grade 7 15 min

Add and subtract mixed numbers

Add and subtract mixed numbers

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1

Introduction & Learning Objectives

Learning Objectives Convert mixed numbers to improper fractions and vice versa. Find a common denominator for fractions with unlike denominators. Add mixed numbers by combining whole number parts and fractional parts. Subtract mixed numbers, including cases requiring regrouping (borrowing). Simplify fractional parts of mixed numbers to their simplest form. Solve real-world problems involving the addition and subtraction of mixed numbers. Ever tried to combine ingredients for a recipe like "2 and a half cups of flour" and "1 and three-quarter cups of sugar"? 🍰 How much do you have in total? In this lesson, you'll learn how to add and subtract mixed numbers, which are numbers that combine a whole number and a fraction. Mastering these operations is c...
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Key Concepts & Vocabulary

TermDefinitionExample Mixed NumberA number consisting of an integer (whole number) and a proper fraction.The mixed number `3 \frac{1}{2}` represents three whole units and one-half of another unit. Improper FractionA fraction where the numerator is greater than or equal to the denominator, meaning its value is one or greater.The improper fraction `\frac{7}{2}` is equivalent to `3 \frac{1}{2}`. Common DenominatorA shared multiple of the denominators of two or more fractions, which is necessary before adding or subtracting them.For fractions `\frac{1}{2}` and `\frac{1}{3}`, the least common denominator is 6. Equivalent FractionsFractions that represent the same value, even though they have different numerators and denominators.`\frac{1}{2}` is equivalent to `\frac{2}{4}` and `\frac{3}{6}`. S...
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Core Formulas

Converting Mixed Numbers to Improper Fractions `A \frac{B}{C} = \frac{(A \times C) + B}{C}` To convert a mixed number `A \frac{B}{C}` to an improper fraction, multiply the whole number `A` by the denominator `C`, add the numerator `B`, and place the result over the original denominator `C`. This is useful when you prefer to perform addition or subtraction by working only with improper fractions. Adding Mixed Numbers (Separate Parts Method) 1. Find a common denominator for the fractional parts. 2. Add the fractional parts. 3. Add the whole number parts. 4. If the fractional sum is an improper fraction, convert it to a mixed number and add its whole part to the existing whole number sum. 5. Simplify the fractional part if possible. This method allows you to handle whole number...

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Sample Practice Questions

Easy
According to the tutorial, which of the following best defines a 'Mixed Number'?
A.fraction where the numerator is larger than the denominator.
B.fraction where the numerator and denominator have no common factors other than 1.
C.number consisting of an integer and a proper fraction.
D.shared multiple of the denominators of two or more fractions.
Easy
Using the formula `A B/C = (A × C + B) / C`, convert the mixed number 4 2/3 into an improper fraction.
A.8/3
B.14/3
C.10/3
D.9/3
Easy
What is the first essential step you must take before adding or subtracting fractions with unlike denominators, such as in the problem 2 1/4 + 1 1/3?
A.Find a common denominator for the fractional parts.
B.Add the whole numbers together.
C.Convert both mixed numbers to improper fractions.
D.Simplify the fractions.

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