Subtract these numbers in you head
How to Subtract numbers from each other in your head
First you subtract the tens column and store your answer to one side in your head,.
You then subtract the units column 7 from the 38 which you have stored in your head.
So you are now left with 38 - 7 which is 31
So you will need to practice this method as it takes a while to perfect.
Practice answering some more questions using your calculator.
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