Here’s an example of a SPEED MATH shortcut for CHECKING SUBTRACTION: (Check) Sub from the CHECKING ANSWERS category.
Make sure to check out SEED NUMBER CONCEPT to understand how Seed numbers are calculated.
When can I use this method?
For checking any Subtraction.
This method can also be used to check problems with a combination of additions and subtractions also.
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Download Practice sheet for CHECKING SUBTRACTION
- Make sure to check out SEED NUMBER CONCEPT to understand how Seed numbers are calculated.
- Any time you come across a seed number values greater than 1-digit, reduce it to a single digit value using the seed number concept.
- Any time you come across a negative (-ve) seed number; add 9 to it to get is positive (+ve) value. Do the same if the seed number is = 0.
- It is the fastest and easiest way to verify your answers.
Related Shortcuts –
Checking Division : (Check) Div
Checking Multiplication : (Check) Mul
Checking Addition : (Check) Add