Add another strategy to the toolboxes of young mathematicians with this elementary math lesson on using number lines to add and subtract fractions.

Encourage young scholars to tap into their inner math-whiz as they add three and four-addend equations. The first 36 problems each have three addends (none over two-digit), and are written horizontally. Next, they complete eight more...

In this math learning exercise, students consider the harmonic series. They assume that the sums move towards infinity and that they are divergent.

In this understanding whole numbers worksheet, 4th graders use a computer program for instruction, then answer 16 problems about addition and subtraction.

In this biology worksheet, students examine the process of respiration and specifically look at the biochemistry of gas exchange at the alveoli.