Important Notes
a. When rounding off a number to the nearest ten, you look at the digit in the place value of ones.b. If this digit is 0, 1,2, 3, or 4, the digit in the place value of tens remain the same, while the digit in the ones place value becomes zero.
c. If the digit in the ones place value is 5,6,7, 8 or 9,add 1 to the digit in the place value of tens, and the digit in the place value of ones becomes zero.
Practice Question 1
Round off 34 to the nearest tens;Answer
The digit in the ones place value is 4.Therefore, the digit in the tens place value (3) remains the same and the one in the ones column changes to 0.
The answer is 30.
Practice Question 2
Round off 47 to the nearest tens;Answer
The digit in the ones place value is 7.Therefore, we add 1 to the digit in the tens place value and the digit in the ones place value becomes 0.
The answer is 50
Practice Question 3
Round off 396 to the nearest tens;Answer
The digit in the ones place value is 6.
Therefore, we add 1 to the digit in the tens place value and the digit in the ones place value becomes 0.
Since the digit in tens column is 9, on adding the 1, we get 10, where we write 0 and carry 1 to the number in the hundreds column, which is 3.
The answer is 400
More rounding-off examples
Practice Questions
Round-off the following numbers to the nearest ten.- 126
- 215
- 111
- 982
- 659