3rd Grade Rounding to the Nearest 10 and 100 Quiz: 10 Questions with Explanations

A 70B 80C 74D 60

74 is before the halfway point 75, so it is closer to 70. Rounding up would need a ones digit of 5 or more.

A 80B 100C 95D 90

85 is halfway between 80 and 90. A halfway number rounds up to 90.

A 600B 540C 500D 400

538 is before the halfway point 550, so it rounds down to 500. The tens digit 3 decides.

A 800B 730C 700D 720

The tens digit is 2, so round down to 700. The 7 in the ones place does not matter.

A 990B 900C 1,100D 1,000

The ones digit 5 rounds up. Tens 9 + 1 makes 10 tens, so the answer is 1,000.

A 68B 64C 75D 76

68 is within 5 of 70, so it rounds to 70. 64 rounds to 60. 75 and 76 round to 80.

A 700B 800C 900D 790

312 rounds to 300 and 489 rounds to 500, so the estimate is 800. Rounding 489 down to 400 gives 700.

A 250B 200C 249D 299

250 is halfway between 200 and 300 and rounds up. 249 rounds down to 200.

A The ones digit, 6B The tens digit, 7C The hundreds digit, 2D The thousands digit, 0

To round to the nearest hundred, look at the tens place. The 7 is 5 or more, so 276 rounds up to 300.

A 400B 300C 200D 323

721 rounds to 700 and 398 rounds to 400, so the estimate is 700 − 400 = 300. The number 323 is the exact difference, not an estimate.