Here’s an example of a SPEED MATH shortcut for SQUARING 2-DIGIT NUMBERS NEAR A BASE : (Sq) NrB2 from the SQUARING AND SQUARE ROOTS category.
When can I use this method?
For squaring any 2-digit numbers.
The number can be either < or > a Base number.
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Download Practice sheet for SQUARING 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)2 = [(B + a) + a] + a2, 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).
- This method is a corollary to the Multiplication method NrB2
Related Shortcuts –
Squaring Numbers near 100 : (Sq) Nr100
Squaring Numbers near 1000 : (Sq) Nr1000
Squaring Numbers near 50 : (Sq) Nr50
Squaring Numbers near 500 : (Sq) Nr500
Squaring 3-digit Numbers near a Base : (Sq) NrB3
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