Example Question #1 : Operations
When subtracting any number by the only number that will change in your answer is the hundreds place.
Example Question #5 : 2nd Grade Math
The pet store has goldfish in a tank. A teacher bought goldfish for her school’s fish tank. How many goldfish does the pet store have left?
This is a subtraction problem because we want to know how many goldfish the pet store has left over after the teacher buys the first and takes them away from the store. We take the number of goldfish that the store had and then subtract the number that the teacher bought.
Example Question #2 : Operations
David is taller than Alison. Alison is tall. How tall is David?
This is an addition problem because we have the difference in height from the question. Alison is inches tall and David is inches taller than her, is our difference. We can add our difference to Alison's height to find out how tall David is.