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Subtraction subtracting by oversubtracting 25185 =(151+100)85 =151+10085 =151+15 =166 In this example,251 is break into 151 and 100 Math tricks 2: subtracting by adding to each number 25185 =(151+100)85 =151+10085 =151+15 =166 In this example,251 is break into 151 and 100 Math tricks 3: subtracting by subtracting to each number 831104 =(8314)(1044) =827100 =727 In this example,251 is break into 151 and 100
Easy way to check your answer: Check the answer by working backward Example:
Add 248 to 295,and see whether you can get 543 back or not.
If the answer(eg.248) add with one of the numbers(eg.295) give you another numbers(eg.543),then your aswer is correct.
