The outer diameter of the math bicycle tire is 0.5 meters. Xiaoming cycles every minute 120. It takes him 20 minutes from home to school, which is 3.768 kilometers away from school.

Calculate the formula according to the meaning of the question:

Outer circumference: 3. 14×0.5= 1.57.

Driving distance:1.57×120 =188.4.

Time: 3768- 188.4 = 20

So it takes 20 minutes to go to school by bike.

Multiplication operation properties:

Multiply the product of several numbers by a number so that any factor in the product can be multiplied by this number and then multiplied by other numbers. For example: (25×3 × 9)×4=25×4×3×9=2700.

Multiply a number by the difference between two numbers, and you can multiply the minuend and the minuend by this number respectively, and then subtract the product. For example: (137-125) × 8 =137× 8-125× 8 = 96.