6, 4, 2, 3 How do you get 24?

Solution: 6X4X(3-2)=24

23×32× 125 (calculated by simple method)

Solution: (23x4) x (8x125) = 92x1000 = 92000.

Grandpa's age is a multiple of 2 and a multiple of 3, which is greater than 60 and less than 70. How old is grandpa this year?

Solution: Between 60 and 70:

Multiply of 2: 62.64.66.68.

Multiply of 3: 63.66.69

It is a multiple of 2 and a multiple of 3: 66.

A: Grandpa is 66 years old this year.