Rules for rounding to tens
Mathematical rounding of a number to the nearest ten.
Second digit before the dot (ten of the number):
- does not change – if the first digit before the dot is less than 5. (0; 1; 2; 3; 4);
- increases by 1 – if the first digit before the dot is greater than or equal to 5. (5; 6; 7; 8; 9).
4673 ≈ 4670
7 is the ten of the number, the second digit before the dot;
3 is the first digit before the dot;
7 is the rounded ten of the number.
Examples
Round the number 122 to tens.
122 ≈ 120. The first digit before the dot 2 is less than 5.
Round the number 125 to tens.
125 ≈ 130. The first digit before the dot is 5.
Round the number 128 to tens.
128 ≈ 130. The first digit before the dot 8 is greater than 5.