Number & Operations Activities from the National Library of Virtual Manipulatives

Count Us In Games-Games to help children understand basic number concepts.

Concentration
Match cards that show different representations of the same numbers.

MultiFlyer
Practice multiplication facts through 12 as you travel through our galaxy and beyond.

The Product Game
A fun interactive game that exercises your skill with factors and multiples!

Multiplication.com--Learn how to multiply at this site.

The Factor Game
Test your factoring ability against a human or the computer.

Counting Shirts & Shorts
Bobbie Bear is planning a vacation and wants to know how many outfits can be made using different colored shirts and pants.

Pan Balance
This double pan balance provides an interesting environment in which to consider the concept of "equivalence."

Fraction, Decimals & Percents

Playing the Fraction Track
Think about how fractions are related to a whole, compare fractional parts of a whole, and find equivalent fractions in this game for 2 players.

Fraction Bars
Excellent site for helping students visualize connections among fractions, decimals, or percents.

Comparing Fractions & Percents
Which is greater: 20% or 3/8? Use this site to visualize fractions & percents in 4 different ways: as slices of a pizza, subsets of people in a group, as a partially filled cup, or as pieces of a chocolate bar.

Comparing All Three
Can you match fractions, decimals or percentages pairs? Try it at this site!