1, equation 1

It is known that the quotient is 4, the remainder is 2 and the dividend is 42. According to the definition of division, we can get an equation: dividend = quotient × divisor+remainder. Substituting the known data: 42=4× divisor +2, we can get the divisor by solving this equation: 42? 2÷4= 10 Therefore, the number filled in the box is 10.

2. Equation 2

Known quotient is 9, remainder is 1, and dividend is 83. According to the definition of division, we can get an equation: dividend = quotient × divisor+remainder. Substituting the known data: 83=9× divisor+1, we can get the divisor by solving this equation: 83? 1÷9=9, so the number in the box is 9.

3. Equation 3

It is known that the quotient is 23, the remainder is 3 and the dividend is 69. According to the definition of division, we can get an equation: dividend = quotient × divisor+remainder. Substituting the known data: 69=23× divisor +3, we can get the divisor by solving this equation: 69? 3÷23=3 So, the number in the box is 3.

4, equation summary

Through the above three examples, we can see that the numbers filled in the box can be calculated by the relationship between quotient, remainder and dividend. This method can be extended to other similar fill-in-the-blank questions. According to the requirements and conditions of the questions, the required graphics can be deduced from the results by using the method of reverse thinking.

Solve the fill-in-the-blank problem and fill in the appropriate number division in the box of grade four.

Basic definitions of 1 and division

Is a mathematical term that refers to dividing one number or quantity by another. In mathematics, division can be expressed as dividend-divisor = quotient ... remainder.

2. Reverse thinking

It is a way of thinking, which refers to the method of thinking backwards to solve the problem from the result or goal of the problem. This way of thinking can help us consider problems from multiple angles and improve the efficiency and accuracy of solving problems.

3. The concept of equation

Is a mathematical term that refers to an equation with unknown numbers. Mathematically, an equation can be expressed as the coefficient of unknown number = known number × unknown number. By solving the equation, we can get the value of the unknown quantity.