Rounding come the nearest ten

This number line has the totality tens significant (720, 730, and also so on). Let"s think around all ofthe numbers between 740 and 750. Which of them space nearer to 740 than to 750? Which ones space nearer come 750?

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Rounding a number come the nearest ten means finding which entirety ten the number is the next to. We usage the symbol≈ once rounding. Read it together “is approximately” or “is about”.

You are watching: Rounding three digit numbers to the nearest ten

Read the instances below. Castle are likewise illustrated ~ above the number line v arrows.

731 ≈ 730

(731 is approximately 730)

767 ≈ 770(767 is about 770)724 ≈ 720(724 is approximately 720)
Numbers that end in 1, 2, 3, or 4 are rounded under to the previous entirety ten.Numbers that end in 5, 6, 7, 8, and 9 room rounded as much as the next entirety ten.Notice the numbers finishing in 5 room rounded up also though actually they space as far from the previous totality ten together they room from the next totality ten. Because that example, 855 is equally much away native 850 together it is native 860, however 855 ≈ 860 as soon as rounding come the nearest ten. 1.Round the numbers to the nearest entirety ten. Usage the number line to help.

a. 243 ≈ _______

b. 287 ≈ _______

c. 251 ≈ _______

d. 298 ≈ _______

e. 266 ≈ _______

f. 214 ≈ _______

g. 255 ≈ _______

h. 295 ≈ _______

i. 307 ≈ _______

j. 302 ≈ _______

k. 276 ≈ _______

l. 242 ≈ _______

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Whole hundreds are whole tens, too

Remember that 100, 200, 300 and all of the other whole hundreds are additionally whole tens. Why? remember 100 is 10 tens. 200 would be 20 tens. So, as soon as rounding 603 come the nearest entirety ten, we obtain 603 ≈ 600. And 799 ≈ 800.


2. Round the number to the nearest ten.


a. 402 ≈ _______

897 ≈ _______

b. 396 ≈ _______ 393 ≈ _______ c. 804 ≈ _______ 805 ≈ _______ d. 97 ≈ _______ 997 ≈ _______

Estimation

When we usage rounded number to calculation with, that is referred to as estimation.

Mrs. Spencer, the principal, to buy books and notebooks because that $547, pencils because that $38, and erasers for $31.We can estimate her complete bill by rounding these numbers to the nearest ten, and adding:$550 + $40 + $30 = $620. Her total bill is about $620.

3. Estimate the complete bill.

a. a computer, $296, and desk, $188

computer around $___________

desk about $___________

total bill around $ ___________

b. a tennis racket, $123, and also balls, $38

racket around $___________

balls around $___________

total billabout $ ___________

c. a movie, $29, MP3 player,$99,and pants, $32

total bill about $ ___________

d. a printer, $65, file $13,and press ink $117

total billabout $ ___________

4. Compose the previous and also the next totality ten, then round the number.

a. ______, 472, ______

472 ≈ _________

b. ______, 829, ______

829 ≈ _________

c. ______, 514, ______

514 ≈ _________

d. ______, 317, ______

317 ≈ _________

e. ______, 608, ______

608 ≈ _________

f. ______, 455, ______

455 ≈ _________

5. Anna desires to purchase a bicycle because that $129. Ring this number come the nearest ten. She earns $30 every week. Exactly how much does she earn in 2 weeks?

In three weeks?

In how numerous weeks go she have enough to to buy the bicycle?

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6. Estimate, utilizing rounded numbers, the complete distance all the means around this triangular course in the forest.Also find the real distance by including the original numbers in columns.

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Estimate: ___________________ ft

7. Round every number to the nearest entirety ten. Location each prize in the cross-number puzzle.

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Math Mammoth add & Subtract 3A self-teaching worktext for 2nd-3rd grade the covers mental addition & subtraction v three-digit numbers, regrouping through three-digit numbers (carrying and borrowing), rounding, estimating, and also word problems. Download ($7.10). Also obtainable as a published copy.