Number & Operations (Grades Pre-K - 2)

Virtual manipulatives related to the NCTM Number & Operations standard for grades Pre-K - 2.

	Bar Chart – Create a bar chart showing quantities or percentages by labeling columns and clicking on values.
	Base Blocks – Illustrate addition and subtraction in a variety of bases.
	Base Blocks Addition – Use base ten blocks to model grouping in addition.
	Base Blocks Decimals – Add and subtract decimal values using base blocks.
	Base Blocks Subtraction – Use base ten blocks to model separation of groups in subtraction.
	Chip Abacus – Learn about carrying and digits using chips.
	Circle 99 – A puzzle involving adding positive and negative integers to sum to ninety nine.
	Color Chips - Addition – Use color chips to illustrate addition of integers.
	Color Patterns – Arrange colors to complete a pattern.
	Diffy – Solve an interesting puzzle involving the differences of given numbers.
	Fraction Bars – Learn about fractions using fraction bars.
	Fractions - Naming – Write the fraction corresponding to the highlighted portion of a shape.
	Fractions - Parts of a Whole – Relates parts of a whole unit to written description and fraction.
	Fractions - Visualizing – Illustrate a fraction by dividing a shape and highlighting the appropriate parts.
	Mastermind – Use inference and logic to play a game and guess a hidden pattern of pegs.
	Money – Learn about money by counting and making change.
	Number Line Arithmetic – Illustrates arithmetic operations using a number line.
	Number Line Bars – Use bars to show addition, subtraction, multiplication, and division on a number line.
	Number Line Bars - Fractions – Divide fractions using number line bars.
	Number Line Bounce – Number line addition and subtraction game.
	Number Patterns – Discover the pattern and complete a sequence of numbers.
	Percentages – Discover relationships between fractions, percents, and decimals.
	Pie Chart – Explore percentages and fractions using pie charts.
	Rectangle Division – Visualize and practice dividing numbers by using an area representation.
	Rectangle Multiplication – Visualize the multiplication of two numbers as an area.
	Rectangle Multiplication of Integers – Visualize and practice multiplying integers using an area representation.
	Sieve of Eratosthenes – Relate number patterns with visual patterns.
	Spinners – Work with spinners to learn about numbers and probabilities.