Subtract fractions with the same denominator | Maths | Quizalize & Oak National Academy

Starter quiz

Which of these definitions describes the minuend?
- A number subtracted from another number.
- The number being subtracted from. ✓
- The result after subtracting one number from another.
Which number is the subtrahend in the following equation? 12 − 5 = 7
- 12
- 5 ✓
- 7
What subtraction is being shown by this number line?
- 30 = 60 − 30 ✓
- 60 − 30 = 30 ✓
- 30 − 60 = 30
- 60 − 60 = 30
Each marble in a bag is $\frac{1}{12}$ of the whole bag. How many marbles are there in the bag?
- 1
- 10
- 12 ✓
- 13
$The bar model shows three equal parts of the whole. What fraction can be used to label this?$

The bar model shows three equal parts of the whole. What fraction can be used to label this?
- $\frac{1}{2}$
- $\frac{1}{3}$ ✓
- $\frac{1}{4}$
Select the correct sum. $\frac{3}{9}$ + $\frac{4}{9}$ = ___
- $\frac{7}{9}$ ✓
- $\frac{6}{9}$
- $\frac{7}{18}$
- $\frac{1}{9}$

Exit quiz

$What fraction subtraction equation is being represented by the bar model?$

What fraction subtraction equation is being represented by the bar model?
- $\frac{7}{7}$ − $\frac{3}{7}$ = $\frac{4}{0}$
- $\frac{7}{7}$ − $\frac{3}{7}$ = $\frac{4}{14}$
- $\frac{7}{7}$ − $\frac{3}{7}$ = $\frac{4}{7}$ ✓
- $\frac{7}{7}$ − $\frac{3}{7}$ = 4
Aisha and Alex share a pizza cut into 8 slices. Alex eats sixth-eighths of the pizza. How much does Aisha eat? Aisha eats ___ of the pizza.
- $\frac{1}{8}$
- $\frac{2}{8}$ ✓
- $\frac{2}{16}$
- $\frac{2}{2}$
A full box of eggs contains 12 eggs. First there were 10 eggs in the box, then 4 were used to make pancakes. Which equation matches this problem?
- $\frac{10}{12}$ − $\frac{4}{12}$ = $\frac{14}{12}$
- $\frac{10}{12}$ − $\frac{4}{12}$ = $\frac{6}{12}$ ✓
- $\frac{10}{12}$ − $\frac{4}{12}$ = $\frac{6}{0}$
- $\frac{10}{12}$ − $\frac{4}{12}$ = $\frac{6}{24}$
$A full box of eggs contains 12 eggs. First there were 8 eggs in the box, then 7 were used to make pancakes and cakes. Which fraction represents the number of eggs left?$

A full box of eggs contains 12 eggs. First there were 8 eggs in the box, then 7 were used to make pancakes and cakes. Which fraction represents the number of eggs left?
- $\frac{7}{8}$
- $\frac{1}{7}$
- $\frac{1}{8}$
- $\frac{1}{12}$ ✓
$\frac{11}{12}$ − $\frac{7}{12}$ = ___
- $\frac{4}{12}$ ✓
- $\frac{4}{10}$
- $\frac{4}{1}$
- $\frac{4}{0}$
- $\frac{4}{24}$
$\frac{9}{10}$ − $\frac{1}{10}$ − $\frac{5}{10}$ = ___
- $\frac{3}{10}$ ✓
- $\frac{4}{10}$
- $\frac{5}{10}$
- $\frac{3}{20}$
- $\frac{4}{20}$

Worksheet

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Presentation

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Lesson Details

Key learning points

If 5 subtract 2 is equal to 3 then 5 one sevenths subtract 2 one sevenths is equal to 3 one sevenths.
To subtract fractions with the same denominator you subtract the numerators using the language of unitising.
If fractions have the same denominator they can be subtracted.

Common misconception

Children will rush to subtract both the numerator and the denominator when performing a subtraction of fractions with either structure in the lesson.

Reinforce the concept of the unit being the fraction which is denoted by the denominator. Get children to perform subtractions using real life objects before moving them onto using fractions instead, perhaps using unit fractions to begin with.

Keywords

Minuend - The minuend is the number being subtracted from.
Subtrahend - A subtrahend is a number subtracted from another. There can be more than one.
Numerator - A numerator is the top number in a fraction. It shows how many parts we have.
Denominator - A denominator is the bottom number in a fraction. It shows how many parts a whole has been divided into.