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CLIP 10253

Subtracting tens and checking with the reverse operation

Subtracting tens and checking with the reverse operation
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Key Info
  • Subtracting tens and checking with the reverse operation
  • Duration: 02:17
  • One hundred cartoon ants are arranged on a parade ground in rows of ten. A watching ant does subtraction sums to work out how many ants are left after rows of ten leave the ground. The ant checks her calculation using the reverse operation by adding the rows to the remainder as they return. She visibly records and talks through her calculations as the rows come and go.
  • Subject:

    Maths

       Topic:

    Calculations: Subtraction

  • Keywords: subtraction, subtract, checking, take away, minus
Ideas for use in class
  • To demonstrate checking calculations using reverse operations.
Background details
  • Clip language : English
  • Aspect ratio : 16x9

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