Add 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.


Now that you understand what a fraction is, what’s a numerator and what’s a denominator, you can start doing operations with fractions. The easiest place to start is in adding fractions with like denominators, or ‘common denominators’.

Video: Add Like Fractions

This video comes from our game, Fish Lake. You can get it here.

Technology required

To play Fish Lake, you need iOS devices (iPad and iPhone), Windows, and Mac.

Supplemental Game

In Fish Lake, players practice with fractions while learning math problem-solving strategies. They’ll also be introduced to Native American history. Watch out for poisonous snakes! Canoe through the rapids. Find enough food for your village’s survival. Figure out “what’s fair.” Who knew you could get this excited about fractions? Recommended for Grades 4 to 6.

Fish Lake
Canoeing minigame in Fish Lake.

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