4th Grade Rounding Whole Numbers Quiz: 10 Questions with Explanations

A \(5,800\)B \(5,750\)C \(5,700\)D \(6,000\)

The digit to the right of the hundreds place is 4, so keep 7 hundreds. Rounding up to 5,800 is a common mistake.

A \(37,000\)B \(36,000\)C \(40,000\)D \(36,500\)

A number halfway between two thousands rounds up. 36,500 is halfway between 36,000 and 37,000, so it rounds to 37,000.

A \(460\)B \(450\)C \(500\)D \(457\)

457 is 3 away from 460 and 7 away from 450, so it rounds to 460.

A \(9,900\)B \(10,000\)C \(9,970\)D \(9,000\)

The hundreds digit 9 is followed by 7, so round up. 99 hundreds plus 1 hundred is 100 hundreds, which is 10,000.

A \(280,000\)B \(290,000\)C \(285,000\)D \(300,000\)

The ten thousands digit is 8 and the digit to its right is 4, so keep the 8. Rounding up gives 290,000, which is a common mistake.

A \(4,500\)B \(3,640\)C \(3,490\)D \(4,620\)

Attendance rounds to 4,000 from 3,500 up to 4,499. Only 3,640 is in that range. 4,500 and 4,620 round up to 5,000, and 3,490 rounds down to 3,000.

A \(8,000\)B \(8,963\)C \(10,000\)D \(9,000\)

5,823 rounds to 6,000 and 3,140 rounds to 3,000, so the estimate is 9,000. The exact sum 8,963 is not an estimate.

A \(20,000\)B \(30,000\)C \(27,000\)D \(40,000\)

48,720 rounds to 50,000 and 21,390 rounds to 20,000. Then 50,000 minus 20,000 is 30,000.

A \(23,500\)B \(22,400\)C \(22,600\)D \(23,600\)

Numbers from 22,500 to 23,499 round to 23,000. Only 22,600 is in that range.

A It rounds to \(2,400\) because 4 is even.B It rounds to \(2,000\) because 2 is first.C It rounds to \(3,000\) because 45 is large.D It rounds to \(2,500\) because the digit to the right is 5.

The digit to the right of the hundreds place is 5, so the hundreds digit goes up: 2,450 rounds to 2,500.