Chapter 1
Abacus

Represent numbers using an abacus (place value)

Base Blocks

Represent whole numbers through thousands using place-value models

Money Make a dollar, calculate change, or make a specific amount using bills and coins
Number Line Arithmetic Use a number line to visualize operations

Chapter 2
Abacus (operations)

Find simple sums or differences using an abacus

Add whole numbers through thousands using place-value models

Chip Abacus

Regroup ones as tens and tens as hundreds, and vice versa to prepare for regrouping in addition and subtraction

Circle 21

Place three positive numbers that sum to 21 inside a circle

Circle 99

Place three whole numbers that sum to 99 inside a circle

Chapter 3
Base Blocks Subtraction Subtract whole numbers through thousands using place-value models
Diffy Choose between whole numbers, integers, fractions, decimals, or money amounts to find the difference between the pair of numbers on each side of a square
Chip Abacus

Regroup ones as tens and tens as hundreds, and vice versa to prepare for regrouping in addition and subtraction

Chapter 4
Number Line Arithmetic Use a number line to visualize operations

Chapter 5
Number Line Arithmetic Use a number line to visualize operations

Chapter 6
Number Line Arithmetic Use a number line to visualize operations

Chapter 7
Bar Chart Make a bar graph
Coin Tossing Use a random generator to model tossing a coin repeatedly and recording the results
Pie Chart Make circle graphs
Spinners Spin a spinner and record the results
Stick or Switch Explore the probabilty of winning a "Let's Make a Deal" game

Chapter 8
Coin Problem Find the counterfeit coin (light or heavy) in a set of identical coins
Converting Units Solve unit conversion problems or create your own
Fill and Pour Manipulate two containers of liquid to achieve a target volume in one container
Fill and Pour Solve unit conversion problems or create your own
How High? Explore the conservation of volume by pouring a liquid from a container to a differently shaped container
Ladybug Leaf Use action buttons to direct a ladybug to a leaf
Ladybug Mazes Use action buttons to direct a ladybug through a maze
Time-Analog and Digital Clocks Tell time using analog and digital clocks
Time-What Time Will It Be? Find the elapsed time

Chapter 9
Attribute Blocks Sort shapes using color, shape, and size
Attribute Trains

Complete patterns of shapes, numbers, or colors

Color Patterns Recognize, describe, and extend color patterns
Counting All Pairs Plot points on a coordinate grid
Geoboard Color and make specific shapes
Geoboard Subdivide, combine, and transform shapes using a geoboard
Geoboard-Circular Draw and compare two-dimensional shapes using a circular geoboard
Geoboard-Isometric Construct three-dimensional shapes
Pattern Blocks Create various patterns of shape, including symmetrical patterns
Pinwheel Tiling Manipulate right triangles to make Pinwheel Triangles
Platonic Solids Manipulate solid figures to identify the number faces, vertices, and edges; explore Euler's Formula
Space Blocks Match nets with the appropriate solid figure
Tangrams Build different shapes from a tangram

Chapter 10
Rectangle Multiplication Visualize the product of two factors using an array

Chapter 11
Rectangle Division Practice division using 10 x 10, 20 x 20, or 30 x 30 grids

Chapter 12
Diffy Choose between whole numbers, integers, fractions, decimals, or money amounts to find the difference between the pair of numbers on each side of a square
Fraction Bars Explore the relationhip between fractions
Fraction Pieces Manipulate fractional pieces of a circular or square region
Fractions-Comparing Recognize and generate equivalent forms of commonly used fractions to compare fractions
Fractions-Equivalent Recognize and generate equivalent forms of commonly used fractions
Fractions-Naming Identify the fraction that represents the model
Fractions-Parts of a Whole Model commonly used fractions
Fractions-Rectangle Multiplication Use the area model to multiply fractions
Fractions-Visualizing Model commonly used fractions using various shapes
Number Line Bars-Fractions Use adjustable color bars to illustrate arithmetic operations with fractions on a number line

Chapter 13
Base Blocks Represent decimals through thousandths using place-value models
Base Blocks Decimals

Add decimals through thousandths using place-value models

Diffy Choose between whole numbers, integers, fractions, decimals, or money amounts to find the difference between the pair of numbers on each side of a square
Circle 3

Place three decimals that sum to 3 inside a circle