5 Adding and Subtracting Fractions 11 Aims To

5 Adding and Subtracting Fractions 11 Aims: • To convert mixed numbers to improper fractions • To add and subtract fractions

Key vocabulary Numerator Denominator Equivalent Improper Fraction Mixed Number Simplify

Convert mixed number / improper 1 2 4 3 3 7 4 1 5 9 4 24 7 2 5 9 9 5 47 9 3 1 4 13 4

How to add / subtract fractions x 5 Denominators must be the same! x 7 Make each fraction an equivalent fraction with a common denominator x 5 x 9 Only add the numerators Only subtract the numerators Leave in simplest form

How to add / subtract fractions x 3 x 5 Denominators must be the same! Convert to improper fractions x 3 x 7 x 3 Only add the numerators x 7 Only subtract the numerator Leave in simplest form

Practice

Problem solving and reasoning

Problem solving and reasoning Here is an isosceles triangle. Find the perimeter of the triangle. 1 ½ + 5 = 1 ½ 1½ 5

Problem solving and reasoning Explain how you know the answer to this calculation is wrong without working out the correct answer. • The answer should be bigger than 1 because both ¾ and 2/3 are bigger than ½. • The answer should be bigger than ¾ but 5/7 is smaller than ¾.

Adding and Subtracting Fractions Codebreaker