Assuming that 10 is correct, you can get: 10×8=80 points.

Now it's only 4 1 minute, less: 80-4 1=39 minutes.

For every mistake 1, 8 points are not allowed and 5 points are deducted, so the score is as low as 8+5= 13.

Wrong: 39÷ 13=3 questions

That's right: 10-3=7 questions

Extended data addition: operation of combining two numbers into one number/operation of combining two decimals into one decimal/operation of combining two fractions into one fractional subtraction: operation of finding the other addend by knowing two addends and one of them.

Multiplication: A simple operation to find the sum of several identical addends. The meaning of decimal multiplication by integer is the same as that of integer multiplication. Multiplying a number by a pure decimal means finding a few tenths and a few percent of this number ... The meaning of multiplying a fraction by an integer is the same as that of integer multiplication.

Division: the operation of finding another factor by knowing the product of two factors and one of them. It means the same as integer division.