This unit introduces students to "The Difference Bar" digital learning object, a tool to help students work out the difference between two numbers by breaking numbers into parts.
This unit is for students working at stage 5 of the Number Framework, Curriculum Level 2, i.e. students who have developed a part-whole strategy for addition and subtraction. Student at this level have just started to understand and use part whole thinking to solve problems.
This digital learning object has two versions, one where difference problems are generated and one where students and teachers can make up their own difference problems. The generated problems at this level involve 2 two-digit numbers where the difference is less than ten and you can make problems to find the difference between any single digit number and any two-digit number.
This unit provides problems that can be used by the teacher when working with groups of students and problems for students to work on independent of the teacher.
Level Two > Number and Algebra