# Digital Learning Objects

## Level Four

### Arrays

Level Four
Number Arrays explores the array model for multiplication and division.
Arrays: factor families
Arrays: word problems with products from 10 to 30
Arrays: word problems with products from 30 to 50
Arrays: word problems with products from 35 to 64
Arrays: the tool

### Design Briefs

Level Four
Number Design Briefs explores fractions and decimals in the context of proportions of areas.
Design a school
Playground percentages Design a neighbourhood
Design a city
Design a farm
Neighbourhood fractions ### Drive

Level Four
Number Drive helps users solve proportional problems with distance and time.
Drive: easy problems

### Integer Cruncher

Level Four
Number Integer Cruncher introduces the addition and subtraction of positive and negative integers.
Integer cruncher: subtraction
Integer cruncher: addition and subtraction ### Loans and Savings

Level Four
Number Loans and Savings helps users find the nett balance of a loan account and a savings account.
Loans and Savings

### Mix Up

Level Four
Number Mix Up helps users find averages of percentages.
Mix Up: equal sized
Mix Up: different sized

### The Percentage Bar

Level Four
Number The Percentage Bar helps users find percentages of numbers.
The Percentage Bar

### Scale Matters

Level Four
Number Scale Matters helps users explore numberlines with a variety of scales.
Scale matters: negatives
Scale matters: range of numbers Level Four
Number

### Squirt

Level Four
Number Squirt helps users explore and express proportional relationships.
Squirt: three containers: level 1
Squirt: three containers: level 2
Squirt: three containers Squirt: three containers: complex proportional relationships

### The Divider

Level Four
Number The Divider helps users solve division problems by partitioning.
The divider: without remainders
The divider: whole number remainders
The divider: solve your own problem
The divider: with or without remainders

### The Fraction Bar

Level Four
Number The Fraction Bar helps users find fractions of numbers.
The Fraction Bar

### The Fractions of Fractions Tool

Level Four
Number The Fractions of Fractions Tool helps users find fractions of fractions using an array model.
The Fractions of Fractions Tool

### The Multiplier

Level Four
Number The Multiplier helps users solve multiplication problems by partitioning and combining.
The multiplier: make your own hard multiplications
The multiplier: generate hard multiplications
The multiplier ### Modeling numbers: decimals

Level Four
Number Modeling Numbers helps users to explore numbers using a variety of representations.
Modeling Numbers: decimals