[Speed Math] SQUARING 2-DIGIT NUMBERS ENDING WITH 9

Here’s an example of a SPEED MATH shortcut for SQUARING 2-DIGIT NUMBERS ENDING WITH 9 : (Sq) LD9d2 from the SQUARING AND SQUARE ROOTS category.

When can I use this method?

For squaring 2-digit numbers ending with 9.

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Download Practice sheet for SQUARING 2-DIGIT NUMBERS ENDING WITH 9

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Notes –

1. This method uses the concept (a – 1)² = a² – [(a – 1) + a], where ‘(a – 1)’ is the number ending with 9.

Related Shortcuts –

Squaring 2-digit Numbers ending with 1: (Sq) LD1d2
Squaring 2-digit Numbers ending with 4: (Sq) LD4d2
Squaring 2-digit Numbers ending with 6: (Sq) LD6d2

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