Number & Operations (Grades 3 - 5)\nVirtual manipulatives related to the NCTM Number & Operations standard for grades 3 - 5.\nAbacus, Bar Chart, Base Blocks, Base Blocks Addition, Base Blocks Decimals, Base Blocks Subtraction, Chip Abacus, Circle 0, Circle 21, Circle 3, Circle 99, Color Chips - Addition, Color Chips - Subtraction, Color Patterns, Diffy, Factor Tree, Fraction Bars, Fraction Pieces, Fractions - Adding, Fractions - Comparing, Fractions - Equivalent, Fractions - Naming, Fractions - Parts of a Whole, Fractions - Visualizing, Grapher, Mastermind, Money, Number Line Arithmetic, Number Line Bars, Number Line Bars - Fractions, Number Line Bounce, Number Patterns, Number Puzzles, Peg Puzzle, Percentages, Pie Chart, Rectangle Division, Rectangle Multiplication, Rectangle Multiplication of Integers, Sieve of Eratosthenes, Tangrams, Venn Diagrams\n