Higher LowerInvestigations Recommended for Grades: 4, 5Students turn over 5 cards to reveal their value then place them in order from smallest to largest. Students in grades 4 and 5 can focus on ordering the fractions and decimal cards or design their own cards with numbers, fractions or measures. Note that equivalent fractions aren't placed on top of one another, but instead go next to each other, in either order.

Dirt Bike Tug Team (Arcademics)Investigations Recommended for Grades: 4, 5In this videogamelike game, players compare two fractions and select the symbol (<, =, >) that accurately describes the comparison. Players can play against each other or the computer. After, the game provides statistics including information about errors.

Falling NumbersInvestigations Recommended for Grades: 4, 5Play against the computer or another person. Players select a numbered leaf that shows the answer to question being asked, which are about fractions of sets (e.g. ½ of 24 or ¼ of 40). (Fromcounton.org.)

Fraction GameInvestigations Recommended for Grades: 4, 5Students draw a fraction card and then move that amount on one or more fraction lines. The goal is to move all of the markers to the right side of the line (1).

Matching Fractions, Decimals, and PercentagesInvestigations Recommended for Grades: 4, 5A concentration game played with 16, 20 or 24 fraction, decimal, and percent cards. Students find pairs of cards that are equivalent. (From NRICH.)

Frosty FractionsInvestigations Recommended for Grades: 4, 5Play with a partner. Take turns covering the sum of two fractions with a snowflake, if available. This often requires the use of equivalent fractions, and a set of fractions bars is included below the board for support. The first player to cover 3 in a row wins. (Fromcounton.org.)

IXL Third Grade Fractions Unit
Recommended for Grades: 3
Here are a number of fraction activities from IXL:
Modeling Fractions  Jelly GolfRecommended for Grades: 3, 4, 5ids love this game! It has smooth animation and cute cartoon figures. Set the swing according to the fraction given, and shoot the ball into the air.
Setting the swing correctly will bring the ball all the way exactly into the hole. 
Identify Fractions  Fraction BallsRecommended for Grades: 3, 4A fraction ball is swinging at the top. Use the spacebar to drop it, and guide it with the arrow keys to the container representing this fraction.

Matching Written Fractions to Numeral and Visual Fractions  Fishy FractionsRecommended for Grades: 3, 4Notice! Click the green "START ACTIVITY" button at the game's page to enter the game. A fraction will be written in words. Click the fish which has that fraction appear as a numerical or as a visual fraction.

Understanding Simple Fractions  Visual FractionsRecommended for Grades: 3, 4After a short intro you can choose between level 1 and levels 2 and 3. In level 1 you will be asked to sort a fraction of the objects (for example: sort 1/2 of the objects into the other box). In levels 2 and 3 you will be asked to click on shapes that have some fraction shaded in (for exmple: 1/2 of the shape is shaded).

Equivalent Fraction  Target ShootRecommended for Grades: 3, 4, 5Four targets with fractions appear on the screen along with a question such as : "What is 2/3 equivalent to?". Shoot the target with the correct answer by clicking it with the mouse.There are 20 questions, click carefuly because you get 1 point for every correct answer, but you lose 1 point for every wrong answer.

Equivalent Fraction  Fraction FrenzyRecommended for Grades: 3, 4, 5A set of cards with fractions appear on the screen. Find the matching cards with the equivalent fractions, and click them. After finding all the matching cards, a new level begins with more cards. The game ends if the time ran out before you completed a level.

Equivalent Fractions  Matching (Easy)Recommended for Grades: 3, 4, 5Match pairs of equivalent fractions by clicking them with the mouse. This version includes 4 pairs with easy fractions.

Equivalent Fractions  Matching (Advanced)Recommended for Grades: 3, 4, 5Another version of the matching game, with more and harder pairs.

Comparison Shoot OutRecommended for Grades: 3, 4, 5Comparing Fractions with Different Denominators  Two fractions appear on the field. Click and hold the mouse button down, to show the three comparison signs (<, = and >). Drag the mouse to the correct sign and release the button.Answering correctly will result in a Goal!

Balloon Pop Fractions
Recommended for Grades: 4, 5Ordering and Comparing Fractions with Different Denominators  Click on the balloons to pop them in ascending order of the fractions.
There are three levels to choose from (see the options on the left menu on the game's website). Level 1: Two balloons. Level 2: Three Ballons. Level 3: Four Balloons. 
Simple and Mixed Fractions

Ordering Simple Fractions  Fractions GalleryRecommended for Grades: 4, 5Drag the fractions from the bottom and place them on the wall, in ascending order from left to right. When finished, click the "Done" button, to receive your next set.
You can use the red arrows to toggle between the fractions, and see all of them before placing them on the wall (though you can always take them off the wall to correct mistakes). 
Two Step Sum of Adding Proper Fractions
Recommended for Grades: 3, 4, 5This manipulative illustrates the twostep process of adding proper fractions. The first step in adding fractions is to identify a common group name (denominator). Finding a common group name means separating two (or more) whole groups into the same number of parts.

Renaming FractionsRecommended for Grades: 3, 4, 5Renaming a fraction means finding an equivalent fraction.

BBC Percent & Fractions
Investigations Recommended for Grades: 4, 5
Great BBC site with videos and games on percent and fractions.