Rounding to a required degree of accuracy · seed 1 · A4, ink-friendly. The answer key prints on its own page for grown-ups.
Rounding to a given accuracy
Mathematics · Number Representation & Place Value · ages 10-11
Name ______________________ Date ____________
You want to round 3.72 to 1 decimal place. Which digit do you look at to decide?
The digit in the place you're rounding to
The digit right after the place you're rounding to
The very first digit of the number
Round 3.72 to 1 decimal place.
3.7
3.8
3.72
If the digit right after the place you're rounding to is 5 or more, you round that place up.
Circle one: TrueFalse
Round 82,461 to the nearest 1,000. Type your answer.
Answer: ______________
Round 2.8362 to 2 decimal places.
2.83
2.84
2.85
Estimate 6.1 × 3.9 by rounding each number first.
6 × 4 = 24
6 × 3 = 18
7 × 4 = 28
Josh rounds 3.748 to 1 decimal place and writes 3.8. What should he have done?
He should have looked at the hundredths digit (4), which is less than 5, so the answer should be 3.7
He rounded correctly since 3.748 rounds to 3.8
He should have looked at the ones digit instead of the hundredths digit
Zara rounds 4,382,915 to the nearest 100,000 and writes 4,300,000. What mistake did she make?
She ignored the next digit and rounded down instead of up, so it should be 4,400,000
She rounded to the nearest 10,000 instead of 100,000
She made no mistake; 4,300,000 is correct
Answer key
For grown-ups. Fold this page away before handing over the rest.
Rounding to a given accuracy W1-mt__casygEB85-s1
The digit right after the place you're rounding to · Only the digit right after the place you're rounding to tells you whether to round up or leave it alone.
3.7 · The digit after the tenths place is 2, which is less than 5, so the tenths digit stays the same: 3.7.
True · 5 or more always means round up. That's the whole rule.
82000 · The digit after the thousands place is 4, which is less than 5, so the thousands digit stays at 2: 82,000.
2.84 · After 2.83, the next digit is 6. Since 6 is 5 or more, the hundredths digit rounds up to 2.84.
6 × 4 = 24 · Round 6.1 to 6 and 3.9 to 4, then multiply: 6 × 4 = 24.
He should have looked at the hundredths digit (4), which is less than 5, so the answer should be 3.7 · The digit after the tenths place is 4, which is less than 5, so the tenths digit stays at 7. The correct answer is 3.7.
She ignored the next digit and rounded down instead of up, so it should be 4,400,000 · The digit right after the hundred-thousands place is 8, so it should round up, not down. The correct answer is 4,400,000.