Solve simple mathematical problems using subtraction. 

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How often do people have to solve subtraction problems in everyday life? There are eight seats in the car, one of them is for the driver. How many people can join him on a trip? How can we decide this? From the total number of seats, take away the driver's seat that he has already occupied, and you will find out that seven more passengers can go along with the driver.  

I have ten coins. I'm going to spend 6 of them on a hearty meal. Will I have enough remaining money for a dessert that costs three coins? I subtract six from ten and compare the result with the price of the dessert. Four is greater than three. I will buy a dessert, and I will have one more coin left!

We solve such problems several times a day. To make it easier, practice subtracting numbers when solving math problems.

Here is the text of the problem, a drawing, and a solution.

There are six doors in the castle, four of which are closed. How many doors can you use to enter the castle? 

We know the total number of doors is six. The number of the locked doors is four, it is a part of a whole number. We need to find the number of opened doors. To do this, we subtract the part from the whole: 6-4. Look at the drawing: there are four closed doors out of six. Count the remaining doors. What is the answer? We may enter the castle through 2 doors.

Find a solution for all the problems.

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