The difference bar: make your own hard subtractions

Learning Material  |  Interactive Lesson

Learn how to split up numbers in your head. Use a linear partitioning tool to help find the difference between pairs of two-digit numbers such as 27 and 86. Choose your own pairs of numbers. Split the numbers into parts that are easy to work with, work out each part and then solve the original calculation. This learning object is one in a series of five objects.
1. Students use a linear model to solve differences mentally.
2. Students partition numbers and investigate strategies to solve differences mentally.
3. Students apply the associative principle to solve differences mentally.

Curriculum Information

K to 12
Grade 4, Grade 3, Grade 5, Grade 6
Numbers and Number Sense
Educators, Learners, Students

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Education Services Australia
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