Here’s an example of a **SPEED MATH** shortcut for **CUBING 2-DIGIT NUMBERS NEAR A BASE: (Cub) NrB2 ** from the **CUBING AND CUBE ROOTS** category.

**When can I use this method?**

For cubing any 2-digit numbers.

The number can be either < or > a Base number.

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** Download Practice sheet for CUBING 2-DIGIT NUMBERS NEAR A BASE**

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**Notes –**

- When selecting a Base number, prefer a number that is near the number to be squared as well as it should be easy to multiply with (prefer round numbers).
- This method uses the concept (B + a)3 = [(B + 3a) B2] + [(3a2) B] + [a3], where ‘(B + a)’ is the number to be squared, ‘B’ is the Base number and ‘a’ is the difference.
- Whenever the number is more than the Base number, the difference is written as positive (+ve).
- Whenever the number is less than Base Number, the difference is written as negative (-ve).

**Related Shortcuts –**

Cubing Numbers near 10: (Cub) Nr10

Cubing Numbers near 100: (Cub) Nr100

Cubing Numbers near 1000: (Cub) Nr1000

Cubing 3-digit Numbers near a Base: (Cub) NrB3

Cubing 4-digit Numbers near a Base: (Cub) NrB4

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