How to Teach Adding Fractions

Start with words, not symbols

Write “2 eighths + 3 eighths” with the word spelled out. Kids almost never add the bottoms when the bottom is a word. The word works as a unit, like inches or apples. Once that feels obvious, swap the word for the symbol. This small step is the best defense against the add-the-bottoms habit.

Make the mistake visible

Don't just mark 3/8 wrong. Draw it. Shade 1/4 and 2/4 on a bar, then shade 3/8 on another bar of the same size. Kids can see that 3/8 is less than the 2/4 they started with: they added, and the amount shrank. That contradiction teaches more than any rule. Try 1/2 + 1/2 too: adding the bottoms gives 2/4, which is only one half, when any child knows two halves make a whole.

Then subtraction, then unlike denominators

Subtraction is the same idea: 5/8 take away 2/8 is 3/8. Keep answers at 1 or below at first, then let sums go past a whole. Only move to unlike denominators once equivalent fractions are comfortable, since that's the skill that does all the work there.

How to do it with Fraction Bakery

1. Teach with the adding lesson on the board.
2. Play Combine Boxes: dragging two boxes together shows the slices staying the same size.
3. Print adding like fractions. Start with the cakes sheet.
4. Check that kids can say why the bottom doesn't change. If they can, they're ready for unlike denominators.

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