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.

Before students begin adding fractions, teachers can stress the example of sharing or dividing candy bars equally, so they know to compare like denominators. See also Mathematics Video Teaching ...

When adding or subtracting fractions, you need to look at the denominator. If the denominator is the same, then you can just add or subtract the numerator. If the denominator is different, then ...

To add fractions that have the same denominators, you add together the numerators. And if you started with eight eighths and you’ve used seven eights, how much fuel do you have left to get home? Ah!

Fractions with Like Denominators | 3rd Grade Math. Special | 28m 15s Video has Closed Captions | CC. Students will be able to practice comparing fractions with like denominators.

These students are learning fractions. "So, like two-eighths plus six-eighths, you have eight-eighths. But, since it's in the music, it equals a whole note," explains 9-year-old Donte Arevalo.

All the work with the number line in 3rd grade is meant to lead to a more thorough understanding of what it means to add, subtract, multiply, and divide with fractions.