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The Take-Away Bar

Students explore effective mental strategies for performing subtractions. Strategies include: 'round to the nearest 10', 'subtract tens then ones', 'subtract ones then tens' and the 'compensate' strategy.

Teacher notes

  • A partitioning model is shown so students can see the effect of breaking up numbers to solve a problem using known facts.
  • The strategies are available through an animation that appears on the launch of the learning objects and are also available as 'hints' while students work.
  • The printouts show how the student solved each equation.

Learning objects

The take-away bar picture.

The take-away bar: generate easy subtractions
Students solve problems that take away a single-digit number from a double-digit number.

The take-away bar picture.

The take-away bar: make your own easy subtractions
Students create their own problems, taking away a single-digit number from a double-digit number.

The take-away bar picture.

The take-away bar: generate hard subtractions
Students solve problems that take away a double-digit number from a double-digit number.

The take-away bar picture.

The take-away bar: make your own hard subtractions
Students create their own problems, taking away a double-digit number from a double-digit number.

The take-away bar picture.

The take-away bar: go figure
This is a tutorial that is designed for use by the student or as a demonstration tool for the teacher. The tutorial covers various strategies for subtraction. It is amenable to a screen reader.

The take-away bar picture.

Take-away bars
'Take away bars' is an aggregated learning object combining the five other learning objects.