In adding and subtracting fractions with unlike denominators, you have to get a least common denominator which is exactly like the least common multiple it just so happens to be in the denominator.

Students will find common denominators to help add fractions with unlike denominators. Students will join Ms. MacDonald to find common denominators to help add fractions with unlike denominators.

Use visual fraction models to add and subtract fractions with the same denominators. Use visual fraction models to add and subtract fractions with the same denominators. Notice patterns in the ...