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14.

Subtract Mixed Numbers

Fourth graders have developed a basic understanding of subtraction of mixed numbers with the help of models. This fun mixed numbers game lets them apply that understanding to perform subtraction without relying on any visual models. Children can either convert mixed numbers to improper fractions or make use of the properties of operations to subtract mixed numbers.

What’s inside?

- Subtract mixed numbers by subtracting the whole numbers and fractional parts (with like denominators) separately.

- Complete a mixed number in a subtraction sentence.

Real-World Application

Let’s say we are preparing cupcakes and measuring out ingredients. We measure out, for instance, 4 ½ cups of flour into a bowl and then realise we misread the recipe. It’s actually 2 ⅔ cups of flour. How many cups of flour would we need to remove from our mixing bowl? That’s where subtraction of mixed numbers comes in handy.

What’s next?

Now that children have learned to add and subtract mixed numbers, they can move onto the multiplication of unit fractions by a whole.

Common Core Alignment

4.NF.3.cAdd and subtract mixed numbers with like denominators, e.g., by replacing each mixed number with an equivalent fraction, and/or by using properties of operations and the relationship between addition and subtraction.