🍕 4th grade math · Fractions & Decimals

Add same denominators

When the bottoms match, the pieces are the same size, so just add or take away the tops. The bottom stays the same.

Worked example

Work it out.

Answer: 118

Same-size pieces, so just add the tops: 7 + 4 = 11. The bottom stays 8. So it’s 118. That’s more than 1: 138.

For grown-ups: Add/subtract like denominators, including mixed numbers. Below: three problems to try with the worked answers, and a free printable sheet. Children can practise the same skill as a game, with no sign-up and no ads.

CCSS 4.NF.B.3c

What this practises, for teachers

Practices add/subtract like denominators, including mixed numbers (4.NF.B.3c). A printable sheet with its answer key, worked answers on the page, no accounts.

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For your class

🖨️ Printable sheet and key

On the board with this skill:

More printables, with answer keys, for this grade:

Try three

Work it out.
Show the answer and how
Answer: 14
Same-size pieces, so just subtract the tops: 4 − 2 = 2. The bottom stays 8. So it’s 28 = 14.
Work it out.
Show the answer and how
Answer: 76
Same-size pieces, so just add the tops: 4 + 3 = 7. The bottom stays 6. So it’s 76. That’s more than 1: 116.
Work it out.
Show the answer and how
Answer: 76
Same-size pieces, so just add the tops: 5 + 2 = 7. The bottom stays 6. So it’s 76. That’s more than 1: 116.

Before and after

Learn first: Break a fraction apart (4th)

Comes next: A whole times a fraction (4th)

Name: ____________________Date: ____________Score: ____ / 12

Add same denominators (4th grade)

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Try three

Before and after

Add same denominators (4th grade)

Answer key