From the successful explosion of the first atomic bomb to the explosion of the first hydrogen bomb, it took China 32 months, the United States 88 months and the United States 2.75 letters.

The number of letters is the quotient obtained by dividing one number by another. For example: A÷B=C, it can be said that A is C times that of B. According to the example, it took 32 months in China and 88 months in the United States, so the time in the United States is 88÷32= 1 1/4=2.75 letters China.

Multiple characteristics:

Multiply of 65438+0,2: The end of a number is an even number (0,2,4,6,8), which is a multiple of 2.

Multiplication of 2 and 3: the sum of digits of a number is a multiple of 3, and this number is a multiple of 3.

Multiples of 3 and 4: The last two digits of a number are multiples of 4, and this number is multiples of 4.

Multiples of 4 and 5: A number ends in 0 or 5, and this number is a multiple of 5.

Multiples of 5 and 6: As long as a number is divisible by both 2 and 3, it can be divisible by 6.