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**

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**Notes –**

- 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

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