Categories
Cubing 3-digit Numbers near a Base Cubing and Cube Roots Speed Math

[Speed Math] CUBING 3-DIGIT NUMBERS NEAR A BASE

Here’s an example of a SPEED MATH shortcut for CUBING 3-DIGIT NUMBERS NEAR A BASE: (Cub) NrB3 from the CUBING AND CUBE ROOTS category.

Cubing 3-digit Numbers near a Base

When can I use this method?

For cubing any 3-digit numbers.

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

[contentblock id=google-adsense-post]

[starrater tpl=10]

[tubepress mode=”playlist” playlistValue=”PLE8FC126E9A5F3FCA”]
pdf Download Practice sheet for CUBING 3-DIGIT NUMBERS NEAR A BASE

[contentblock id=google-adsense-post]

Notes –

  1. 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).
  2. 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.
  3. Whenever the number is more than the Base number, the difference is written as positive (+ve).
  4. 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 2-digit Numbers near a Base: (Cub) NrB2
Cubing 4-digit Numbers near a Base: (Cub) NrB4

[contentblock id=speedmath-blockquote]

Leave a Reply

Your email address will not be published. Required fields are marked *