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Cubing and Cube Roots Cubing Numbers near 100 Speed Math

[Speed Math] CUBING NUMBERS NEAR 100

Here’s an example of a SPEED MATH shortcut for CUBING NUMBERS NEAR 100 : (Cub) Nr100 from the CUBING AND CUBE ROOTS category.

Cubing Numbers near 100

When can I use this method?

For cubing numbers near 100.

The number can be either < or > 100.

One can use this method to cube numbers away from 100 as long as it is comfortable to cube the difference portions.

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pdf Download Practice sheet for CUBING NUMBERS NEAR 100

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Notes –

  1. This method uses the concept (100 + a)3 = [(100 + 3a) 1002] + [(3a2) 100] + [a3], where ‘(100 + a)’ is the number near 100 and ‘a’ is the difference.
  2. Whenever the number is more than 100, the difference is written as positive (+ve).
  3. Whenever the number is less than 100, the difference is written as negative (-ve).

Related Shortcuts –

Cubing Numbers near 10: (Cub) Nr10
Cubing Numbers near 1000: (Cub) Nr1000
Cubing 2-digit Numbers near a Base: (Cub) NrB2
Cubing 3-digit Numbers near a Base: (Cub) NrB3
Cubing 4-digit Numbers near a Base: (Cub) NrB4

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