The calculation power of three digit tens

1. The written calculation method of dividing three digits by the whole tens: first, look at the first two digits of the divisor. If the first two digits of the divisor are greater than or equal to the divisor, then the highest digit of the quotient is ten, and the quotient is two digits; If the first two digits of the divisor are less than the divisor, the quotient is one digit. In addition to which one, put the business on which one.

2. Leave the 0 on the right side, multiply the 3-digit number by 1-digit number, and then add a 0 after the result. For example,
123
x 30
3690

3.

Vertical calculation of three digit plus minus tens

312-50 = 262

4. In natural numbers, it's OK. As long as the number is zero, it's the whole tens.

5. Example 223×10
<223
<
>---------
< 2230

6. two thousand four hundred and eighty-four ÷ 10-1 × 10 = 2760,
the correct result is 2760

7. 210÷70=3
240÷80=3
270÷90=3

8. If the three digit is ABC and the integer is M0, then ABC * 10m-abc * m = 2484, ABC * m = 2484 / 9 = 276, and the correct result is ABC * 10m = 2760