Example: Counting down from 5, which number comes next? 4
Start from 5 and count down (5, 4, 3, 2, ...). The number that comes before 5 is 4.
Grades:
1
Example: There are four chairs. Method: Figure out the noun which can be counted and select it. Answer: In the above sentence, the noun 'chairs' can be counted. Therefore, the answer is 'chairs'.
Grades:
5
6
Example:
The value of the digit 1 in 17 is 10 times the value of the digit 1 in 71.